ROTH Capital Partners 25th Annual Growth Stock Conference25th Annual Growth Stock Conference

March 19, 2013Jim BrillPeter Dameris

SVP, CAO & TreasurerPresident & CEO

Safe Harbor

Certain statements made in this presentation should be consideredforward-looking statements as defined in the Private Securities Litigationforward-looking statements as defined in the Private Securities LitigationReform Act of 1995. These include statements about our future results ofoperations and operating targets, our ability to integrate Apex Systems intoour operations successfully, the size of the markets in which we operate,p y, p ,and our efforts to increase our market share. We caution investors thatthese forward-looking statements are not guarantees of futureperformance, and actual results may differ materially. Investors shouldconsider the important risks and uncertainties that may cause actualresults to differ, including those discussed in our annual report on Form10-K for the year ended December 31, 2011, Form 10-Q for the quarter

d d S t b 30 2012 P St t t fil d A il 13 2012 dended September 30, 2012, Proxy Statement filed on April 13, 2012 andother filings we make with the Securities and Exchange Commission. Weassume no obligation to update this presentation, which speaks as oftoday's date

2

today s date.

Key Investment Highlights

• Large and Growing Provider of Professional Staffing Services

• Strategically Positioned to Capture Favorable Trends inStrategically Positioned to Capture Favorable Trends in Professional Staffing

• Differentiated Platform Featuring High-end and Mission Critical g gSkill Sets

• Established Domestic Footprint With Significant Scale

• Experienced Management Team With a Proven Track Record to Execute On Assignment’s Growth

• Attractive Financial Characteristics – Strong Revenue and Substantial Free Cash Flow Generation

3

Large and Growing Provider of Professional Staffing Services

Physician7%

Healthcare4%

• One of the largest professional staffing companies in the U.S.

• $1,460 million FY 2012 revenues1

• Approximately 11,600 contract professionals at ~2 900 clients2

Broad Capabilities

Revenues by Segment1

Apex54%

Life Sciences11%

professionals at 2,900 clients• Focused on placing professionals with

higher end math and science skills

• 1,577 staffing consultants2 in 130 branch offices3 in the U.S., Canada, UK, Belgium, E t bli h d

Oxford24%

, , , g ,Netherlands, Spain and Ireland

• Deliver fast, quality sales and fulfillment services

Established Footprint

• Staffing industry revenue projected to be

Gross Margin by Segment1$134 billion in 20134

• Participates in the most attractive sub-segments of staffing: Healthcare, Life Sciences, Locum Tenens, IT / Engineering

• 2nd largest publicly-traded U.S.

Large and Growing End

Markets 35.3% 34.3% 31.9% 30.6%

27.4% g p yprofessional staffing firm

• One of the highest gross margins in the industry – 30.5% in FY 20121

• High gross margin despite low contribution ( 2%) f t l t /

Attractive Business

M d l

4

1 FY 2012. Pro forma for acquisition of Apex Systems and divestiture of the Nurse Travel Division2 Based on Q4 2012 average and pro forma for the divestiture of the Nurse Travel Division3 As of December 31, 2012 (pro forma for the divestiture of the Nurse Travel Division)4 Staffing Industry Analysts Insight: Staffing Industry Forecast (September 2012)

(~2%) from permanent placement / conversion revenue

ModelOxford Life

SciencesHealthcare Physician Apex

Strategically Positioned to Capture Favorable Trends in Professional Staffing

$52$56

Professional Staffing Industry Revenue Growth Drivers• Variable cost structure provides potential

cost savings and staff flexibility • Aging U S population may constrain

$39 $42 $48

$52 Aging U.S. population may constrain workforce supply

• If implemented, healthcare reform may stimulate staffing demand

• Companies are utilizing temporary labor as a

2009 2010 2011 2012P 2013P

larger percentage of their workforce

Commercial vs. Professional Staffing Trend Structural Change Towards Professional St ffiStaffing

• Driven in part by IT staffing (the largest segment)

• Rapid rate of technological change drivingProfessional

36% Commercial Rapid rate of technological change driving companies to flexible workforces

36%

Commercial64%

Professional53%

47%

5Source: Staffing Industry Analysts. Dollars in billions.

1995

Industry Revenue: $55.4 billion

2013P

Industry Revenue: $134.4 billion

Differentiated Platform Featuring High-end and Mission Critical Skill Sets

Mar

gins

On Assignment has one of the strongest margins in the industry

Revenue Growth: 18%

Gross Margin: 30.5%

PF FY 2012 1

ates

& G

ross

M g

Adj. EBITDA Margin:2 10.3%

Bill

Ra

Industrial Staffing Generalist Staffing Professional Staffing

• Areas of focus: light industrial; clerical and administrative; less specialized skills

• Areas of focus: healthcare, scientific, IT, engineering, finance/accounting, legal

Specialization & Client “Stickiness”

specialized skills

• Widely available skill sets

• Providers seek large placements and compete on price (bulk selling)

g g, g, g• Skills in short supply and critical to revenue

potential of clients• Competition based on quality of professional

and speed and relevancy of response

1 Pro forma for the acquisition of Apex Systems and the divestiture of the Nurse Travel Division2 Adjusted EBITDA presented is one of the non-GAAP financial measures used by the Company and is defined as earnings before interest, taxes, depreciation, and amortization of identifiable intangible assets plus equity-based compensation expense, impairment charges, and acquisition related expenses, which terms might not be calculated in the same manner as, and thus might not be comparable to, similarly titled measures reported by other companies and other one-time items. Refer to Appendix for EBITDA reconciliation.

6

Established Domestic Footprint With Significant Scale

Our 1,577 staffing consultants in 130 branch offices provide staffing solutions for in-demand, skilled talent

United States Canada

UKIreland

Belgium

Netherlands

Spain

Oxford branch officesApex Systems

7

Physician Staffing branch officesHealthcare/Life Sciences branch offices

Experienced Management Team With a Proven Track Record to Execute On Assignment’s Growth

Peter DamerisPresident & CEO

Emmett McGrathPresident

James Brill Senior VP, CAO

& Treasurer

ChristianRutherford

President

MichaelMcGowan

President

Rand BlazerPresident

Apex Systems

Edward PierceExecutive VP

& CFO

• 16 years of staffing/public company

Lab Support & Allied Healthcare

• 26 years of staffing/public company

• 22 years CFO experience, 29 years public

• 19 years of staffing industry experience

VISTA Staffing Solutions

Oxford Global Resources & COO

• 16 years of staffing industry experience (14

• 30 years in professional services

• 11 years CFO experience, 21 years public p y

experience

• Tenure w/ ASGN: 10 years

• Metamor (MMWW) CEO / Chairman

p yexperience

• Tenure w/ ASGN: 8 years

• Yoh Scientific

y pcompany experience

• Tenure w/ ASGN: 6 years

• Diagnostic Products CFO

p

• Named President of VISTA on Nov 1, 2011

• Medfinders, COO

p (yrs w/ Oxford, 2 yrs w/ KELYA)

• Tenure w/ ASGN: 6 years

• Automatic Data Processing

industry (consulting and staffing)

• Joined ASGN in 2012

• Apex Systems

y pcompany experience

• Formerly, director of ASGN since 2007

• FirstChairman

• Quanta (PWR) EVP/COO

Products CFO since 1999

COO

• Weatherby Locums, President

• CompHealth

Processing (ADP), The MEDSTAT Group, Kelly Services (KELYA) Middle Markets Division

p yCOO since 2007

• BearingPoint, CEO

• First Acceptance Corp. (FAC), President

• BindView Development Corp. (BVEW), CFO

8

CFO• Metamor

(MMWW), CFO• Arthur Andersen

& Co.

Operating in Attractive Professional Staffing Segments

Business Description

Apex

• Mission Critical IT

Oxford

• High-end IT

Life Sciences

• Lab Support, Clinical Research and Engineering

Healthcare

• Allied Healthcare

Physician Staffing

• Physician Staffing (locum tenens)

• $163 million11%

• $345 million24%

p

Professionals– Qualified Database

Revenues1

% of Total

• 400 000+

• $791 million54%

• 35 000+

and Engineering

• 44 000+

• $58 million4%

• 30 000+

• $103 million7%

• 1 300+Qualified Database– On Assignment– Full-Time

Employees

• 400,000+• ~6,500• ~1,100

• 35,000+• ~1,500• ~670

• 44,000+• ~2,200• ~300

Key Statistics

30,000+• ~1,000• ~160

• 1,300+• ~280• ~200

• $122/hour• ~5 months• U.S.

– Bill Rate– Engagement Length– Geography

• $59/hour• ~5 months• U.S.

• $35/hour• 2-13 weeks• North America,

Europe

Corporations Corporations Biotech & Pharma

• $37/hour• 3-12 months• North America,

Europe

Hospitals / Physician

• $185/hour• 6 weeks• U.S.

Hospitals / Physician

KeyCustomers

Offices

Labs / Universities

Offices

Healthcare / Gov Agencies

Industry Growth2

9

• FY 2013: 7%• FY 2013: 8%• FY 2013: 8% • FY 2013: 10%• FY 2013: 9%

1 FY 2012 (pro forma for the divestiture of the Nurse Travel Division)2 Staffing Industry Analysts Insight: Staffing Industry Forecast (September 2012)

Strong Cash Flow Generation Through Economic CyclesStrong free cash flow generation in up and down economic cycles allow for quickStrong free cash flow generation in up and down economic cycles allow for quickdeleveraging of the balance sheet

Adj EBITDA to FCF

($ in millions)

Adj. EBITDA-to-FCF Conversion %: 50% 42% 103% 55%45%

Peak economic cycleEconomicdownturn Expansionary period

Bank DebtBalance: $136 $126 $78 $67 $87

36%

$427

$160 $160

$200

Peak economic cycle downturn Expansionary period

$64$78

$126

$57$70

$58$80

$120

$55 $64

$55

$28 $27

$57

$35

$58

$6 $8 $5 $7 $9 $14

$0

$40

FY 2007 FY 2008 PF 2009 PF 2010 PF 2011 PF 2012

Adjusted EBITDA Free Cash Flow Capital Expenditures

10Note: Adjusted EBITDA-to-FCF Conversion % represents standalone ASGN financials for 2007 and 2008;FY 2009 to FY 2012 are pro forma to include Apex Systems

Disciplined Acquisition Strategy

In January 2007, On Assignment acquired Oxford Global Resources

In January 2007, On Assignment acquired VISTA Staffing Solutions

In May 2012, On Assignment acquired Apex Systems

Purchase • On Assignment purchased • On Assignment purchased • On Assignment purchased Apex Purchase Price Oxford for $212 million, or 9.6x

enterprise value to LTM EBITDAVISTA for $49 million Systems for $600 million, or 9.2x

enterprise value to 2011 EBITDA

• Acquisition represented On Assignment’s entry into the large and growing Information Technology and Engineering

• Helped On Assignment increase participation in healthcare staffing by entering them into the locum tenens industry

• Acquisition created the second largest IT staffing provider in the U.S. with approximately $1 billion of revenue from IT staffing

RationaleTechnology and Engineering Services market

• Oxford supported On Assignment’s growth strategy and provided a niche offering in the IT sector

locum tenens industry

• VISTA has over 200 physicians on assignment daily with an average bill rate of approximately $185 per hour

of revenue from IT staffing

• Expands On Assignment’s business into new verticals (financial services, telecom) and new geographies (within the U.S.)

Integration

• No customer overlap and seamless front and back office integration with legacy On Assignment

• 55 out of 60 managers from the O f d i i i ill i h

• Oxford supported On Assignment’s growth strategy and provided a niche offering in the IT sector

• Allows for greater cross-selling i i b f i i l

• Apex and Oxford do not compete against one another

• Expected to be immediately accretive on both a GAAP and cash EPS basis (excluding

i l i )

11

Oxford acquisition are still with On Assignment

opportunities because of minimal overlap in client base

potential synergies)

A Powerful Combination

+

Highly Complementary Acquisition

• Focused on different sets of IT skills – no channel conflicts

Size and Scale

• Together, creates a Top 3 IT staffing provider in the U.S., according to SIA rankings1

– Oxford: High-end IT– Apex: Mission Critical IT

• Limited integration required• Similar business models and corporate cultures

• Based on year-to-date performance above market growth, we believe we will be the 2nd largest IT staffing provider by the end of 2012

• Full spectrum of staffing services (high-end to mission critical)

Revenue Diversification

• Broaden services offering across IT skills• New business verticals and geographical

diversification

Attractive Financial Characteristics

• Accretive to revenue growth and earnings

• Strong conversion of EBITDA to cash flow

12

• Expand permanent placement business• Cross-selling opportunities

• Significant cash tax savings, resulting in anticipated rapid debt paydown

Source: Staffing Industry Analysts Insight: 2012 List of Largest U.S. IT Staffing Firms (July 2012)

1 Based on FY 2011 estimated revenues

Information Technology – Market Overview$ 1Forecasted IT staffing revenues to be $23.1 billion in 20121

- IT staffing involves providing temporary professionals and placing full-time employees in areas rangingfrom multiple platform systems integration to end-user support, including specialists in programming,networking systems integration, database design and help desk support.

Growth Characteristics• IT staffing industry is forecasted to grow by 12% in 2012

and 8% in 20131

IndustryPotential

• IT has recovered quicker than most otherstaffing segments; and is the onlyprofessional staffing segment expectedto surpass 2008 levels in the current

($ in billions)

Projected Market Size1

to surpass 2008 levels in the currentyear

• Growth in 2013 is expected to be drivenby demand in the healthcare industry,given deadlines for conversionsimplemented by the US Dept of Health $30

Shortage ofTalent

implemented by the US Dept. of Health& Human Services

• One of the main constraints on growthin this segment is a shortage of talent,and not necessarily demand due to a

$20.5 $19.8

$15.8 $17.9

$20.6 $23.1

$24.9

$20

$25

and not necessarily demand, due to avariety of organizational, candidate-specific and environmental/marketfactors

$

$10

$15

2007 2008 2009 2010 2011E 2012P 2013P

13Source:1 Staffing Industry Analysts Insight: Staffing Industry Forecast (September 2012)

Apex – Segment Overview$791mm54%

LTM Revenue Split

Apex Revenue Mix1

• Provides mission critical IT skill sets to Fortune 500 and mid-market companies

• 100+ National Accounts with a presence in 51

Fi i l

Technology & Other12%

100 National Accounts with a presence in 51 markets

– Over 16,000 temporary IT professionals staffedannually

• Service clients in:

% of Segment Revenue

Financial25%

Healthcare / Pharma

13%

Se ce c e ts– Information technology, business services, financials

healthcare, pharmaceuticals, government services,consumer industrials and telecommunicationsindustries

P id hi hl kill d f i l

A&D / Gov't / Business Services

18%

I d t i l

Telecom15%

• Provides highly skilled professionals:– Network Engineers– Application Developers– Social & Mobile App. Developers– Help Desk Industrial

17%

p

• Current statistics:– ~6,500 contract professionals at ~600 clients– Average bill rate at $59 an hour– Top 10 clients represent 34% of segment revenue

14

p p g

1 Q4 2012 Average

Oxford – Segment Overview$345mm

24%

LTM Revenue Split

• “The Right Talent. Right now.®”

Oxford’s disciplined focus on the high-end of IT and engineering markets yields industry leading bill rates, success rates and margins

Oxford Revenue Mix1g g

• Four divisions:– Oxford International - nation-wide recruitment for nation-

wide vacancies– Oxford & Associates - local recruitment through branch

Oxford Revenue Mix1

% of Segment Revenue

network– Healthcare IT - functional and technical recruitment in all

aspects of healthcare IT

– Centerpoint - fills permanent staffing needs

Hi h d IT d i i f

Information Technology

37%

Healthcare IT15%

Telecom1%

• High-end IT and engineering focus– Time sensitive project requirements– Traditional average assignment of approx. 5 months– Average bill rate of $122 per hour1

• Proactive recruiting driven organization

Software / Hardware

19%

• Proactive, recruiting-driven organization– Significantly higher success rate filling engagements

than competitors

• Attractive financial characteristics– Minimal client and industry business concentration; no

Engineering27%

15

y ;customer accounts for more than 7% of sales

– Top 10 clients represent 16% of segment revenue

1 Q4 2012 Average

Life Sciences – Market Overview

The U.S. market for outsourced Clinical/Scientific staffing is forecasted to be $1.9 billion in 20121

- Lab support professionals assist clients in the life sciences industries with research and development,product production, quality control and assurance, regulatory affairs and compliance, engineering,consumer testing and clinical research

Industry Highlights

• Highly fragmented; market dynamics are favorable

• Middle market, small/medium clients favor

Projected Market Size1

($ in billions)

,personalized service

• Clinical trials already in progress tend to carry through the length of assignments which can last several months or even years $1.5 $1.6

$1.8 $1.9 $2.1

$1 5

$2.0

$2.5

se e a o t s o e e yea s

• The industry is saturated with start-up companies with venture capital-backed funding that, in some cases, may have a need for the use temporary help or “temp-to-perm” staffing models as a way of $0.0

$0.5

$1.0

$1.5

16

or temp to perm staffing models as a way of managing a flexible workforce

Sources:1 Staffing Industry Analysts Insight: Staffing Industry Forecast (September 2012)

2009 2010 2011E 2012P 2013P

11%

LTM Revenue Split

Life Sciences – Segment Overview $163mm

• The Life Sciences lines of business:– Lab Support– Clinical Research (Valesta)

E i i

Life Sciences Revenue Mix1

– Engineering– Sharpstream (perm placement)

• Operations in the U.S., Canada, and Europe

• Service clients in: 16%

17%

19%

22%

Food & Beverage

Pharmaceutical

Chemical

Biotechnology

– Biotechnology, pharmaceutical, food and beverage,medical device, personal care, materials sciencechemical, nutraceutical, petrochemical consumerproducts, environmental, and contract manufacturingindustries

3%

5%

7%

Medical Devices

Environmental

Material Science

• Provides highly skilled professionals:– Chemists, clinical research associates, clinical lab

assistants, engineers, biologists, biochemists,microbiologists, molecular biologists, food scientists,

l t ff i i li t l b i t t d 2%

3%

3%

3%

Other

Research

University & Municipal

Personal Products

regulatory affairs specialists, lab assistants, andother skilled scientific professionals

• Current statistics:– ~2,200 contract professionals at ~900 clients1

Average bill rate at $35 an hour1

2%

0% 5% 10% 15% 20% 25%

Other

% of Segment Revenue

17

– Average bill rate at $35 an hour1

– Top 10 clients represent 23% of segment revenue

1 Q4 2012 Average

Healthcare – Market Overview

Allied Staffing market revenues forecasted to be $2.9 billion in 20121

- Allied staffing provides locally-based and traveling professionals to clients, including hospitals, clinics,physician offices managed care organizations rehabilitation facilities long-term care facilities etcphysician offices, managed care organizations, rehabilitation facilities, long-term care facilities, etc.Contract professionals in the field include a wide range skilled positions such as specialty nurses, healthinformation management, dialysis and surgical technicians, pharmacists, therapists, hygienists, and dentalprofessionals, etc.

Industry Highlights

• ~13 week assignments

• Within allied healthcare specialties, health ($ in billions)

Projected Market Size1

$2.6 $2.4

$2.7 $2.9

$3.2

$2.5

$3.0

$3.5information technology is projected to grow the fastest

• It is estimated that 60 percent of healthcare workers are in the allied healthcare field2

$1.5

$2.0

2009 2010 2011E 2012P 2013P

• Significant shortage due to growth in population needing care

18Sources:1 Staffing Industry Analysts Insight: Staffing Industry Forecast (September 2012)2 Center for Health Professionals (2011)

Healthcare – Segment Overview$58mm

4%

LTM Revenue Split

• The Healthcare lines of business:– Local Healthcare Staffing

– Health Information Management

Healthcare Revenue Mix1

Allied Travel

– Allied Travel

– Allied Search

• Allied Healthcare professionals: HIM31%

& Search8%

– Offer contract professionals on both a local and traveling basis ranging from x-ray technicians to phlebotomists to billing and coding professionals

• Current statistics: Local

31%

• Current statistics:– Average bill rate approx. $37 an hour1

– Approx. 1,000 contract professionals at approx. 500 clients1

Top 10 clients represented 31% of segment revenue

Local Healthcare

Staffing61%

– Top 10 clients represented 31% of segment revenue

– Gross margin was 31% for the quarter

191 Q4 2012 Average

Physician Staffing (Locum Tenens) – Market Overview$ 1Locum Tenens market revenues forecasted to be $2.1 billion in 20121

G th Ch t i ti

- Locum Tenens: involves placing physicians on temp assignments in a variety of healthcare settings

High Barriers • Need for malpractice insurance Growth Characteristics• Long-term growth may be fueled by a growing shortage,

an aging population, and accessible healthcare insurance to more citizens with healthcare reform, if implemented

• Physicians are “revenue generators”

High BarriersTo Entry

p• Complexities involved in recruiting

and marketing physicians• High level of specialized positions

requiring specific training andexperience

• Lack of licensing reciprocity between

($ in billions)

Projected Market Size1

• Lack of licensing reciprocity betweenstates (unlike nursing)

• Greater lead time needed tosuccessfully fill positions

$2.8Physician Shortage

Physician

• Over the next 15 yrs, the U.S. couldface a shortage of 150,000 doctors2

• The proportion of physicians reportedas working part time increased to

$2.0 $2.1

$2.3

$2.0

$2.4

$2.8

Workforce Demographics

as working part-time increased to22% for male physicians and 44% forfemale physicians, up from 7% and29%, respectively, in 20053

• Flexible work hours or part-timeoptions were cited as one of the topthree ongoing retention initiatives by

$1.6

$1.8 $1.8 $1.8

$1 2

$1.6

$2.0

20

Sources:1 Staffing Industry Analysts Insight: Staffing industry Forecast (September 2012)2 Association of American Medical Colleges – Wall Street Journal (April 2010)3 2011 Retention Survey, American Medical Group Association and Cejka Search

three ongoing retention initiatives bymedical group leaders3

$1.22007 2008 2009 2010 2011E 2012P 2013P

Physician Staffing – Segment Overview$103mm

7%

LTM Revenue Split

• Full-service physician recruitment and staffing company

– Offering contract staffing solutions to

Physician Revenue Mix1

g gcommercial, government, and correctional facilities in a variety of physician specialties

• Places physicians throughout the United States, Australia and New Zealand 10%

21%

31%

Family Practice

Emergency Medicine

Internal Medicine

• Summary statistics:– Approximately 30 specialties through 13

employee teams

– Pool of 1,300+ physicians worldwide, with a 5%

7%

10%

Psychiatry

IM Subspecialties

Surgical

range of medical specialties

– Approximately 280 physicians on assignment daily1

• Average domestic locum tenens i t l t 6 k

4%

4%

5%

Anesthesiology

Maternal

OPN

assignment lasts 6 weeks– New line of business for longer engagements

1%

0% 10% 20% 30% 40%

Radiology

% of Segment Revenue

211 Q4 2012 Average

Strong Financial Performance

$1 237

$1,460 $1,600

• One of the fastest growing staffing firms in the U.S. by revenues

• One of the highest profit margins in the industry

Revenues$ in Millions

$744

$948

$1,237

$400

$800

$1,200

One of the highest profit margins in the industry

• Large scale firm with potential to realize continued operating leverage

$02009 2010 2011 2012

Adjusted EBITDA & MarginGross Profit & Margin

G

Adjuste

j g$ in Millions

g$ in Millions

$121

$151 15%

$120

$160

Adj. EBITDA Adj. EBITDA Margin

$378

$445

30%

40%

$375

$500Gross Profit Gross Margin

Gross M

argin

ed EB

ITDA

Margin

$49

$74

5%

10%

$40

$80

$

$236

$295

10%

20%

$125

$250

$

Source: Company managementNote: All data represents the combined financials of ASGN and Apex and is pro forma for the divestiture ofthe Nurse Travel Division

22

0%$02009 2010 2011 2012

0%$02009 2010 2011 2012

Adj t d EBITDA M i

One of the Highest Operating Margins

10 8%11.7% 11 3%12%

16%

Adjusted EBITDA Margin

10.2%

8.1%

10.8% 10.7%

6.3% 6.7% 6.8% 6.0%

10.0% 10.0% 9.3%

11.3% 9.9%

4%

8%

12%

Not Meaningful

0%Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12 Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12 Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12

Gross Margin and Perm Placement (as a % of Revenue)

g*Negative Adj.

EBITDA

g ( )

29.8% 29.7% 30.7% 30.9% 30.4% 31.2% 30.1% 32.7% 32.9% 32.8%

39.8% 39.6% 40.4% 40.2% 40.3%

30%

40%

50%

2% 2% 2% 2% 2% 4% 4% 5% 5% 4%8% 8% 9% 8% 8%10%

20%

30%

23Source: Company management and company filingsNote: All data represents the combined financials of ASGN and Apex and pro forma for the divestiture of the Nurse Travel Division. KFRC historical data is not adjusted to exclude clinical research business (divested on April 5th, 2012)

2% % % % 2%

0%Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12 Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12 Q4 '11 Q1 '12 Q2 '12 Q3 '12 Q4 '12

Gross Margin Perm %

FY 2012 Financial Performance

($ in thousands, except per share amounts) Actual Actual Year-over-Year FY '12 FY '11 Growth

Apex 508 743$ NA 15%

1

Apex 508,743$ NA Oxford 345,380 266,742 Life Sciences 162,799 155,324 Healthcare 120,104 94,598 Physician 102,679 80,617

C lid t d R

15%

29%

5%

27%

27%

Consolidated Revenues:As Reported 1,239,705 597,281 As Reported; excluding Nurse Travel 1,177,515 547,638 Pro Forma 2 1,459,792 1,237,420

108%

115%

18%

Consolidated Gross Margin:As Reported 31.0% 33.5%As Reported; excluding Nurse Travel 31.3% 34.3%Pro Forma 2 30.5% 30.5%

Adjusted EBITDA 137,753$ 61,233$ Adjusted EBITDA Margin 11.1% 10.3%

EPS 0.89$ 0.64$

125%

241 Apex’s year-over-year growth on a full year pro forma basis2 Pro forma for the acquisition of Apex and the divestiture of the Nurse Travel Division

Management Estimates($ in millions, except per share amounts) Financial Estimates - Q1 2013 Financial Estimates - FY 2013( , p p )

Low End - High End Low End - High End

Revenues $375.0 - $380.0 $1,605.0 - $1,660.0YoY Pro Forma Growth1 9.4% - 10.9% 9.9% - 13.7%

Gross Margin 29.4% - 29.7% 30.3% - 30.5%

SG&A Expenses (excl. amortization expense) $83.0 - $85.0 $350.0 - $375.0

Amortization Expense of Intangible Assets $5.4 $21.0

Net Income:GAAP $8.8 - $10.5 $56.0 - $60.0Adj t d2 $17 0 $18 7 $88 2 $92 2Adjusted2 $17.0 - $18.7 $88.2 - $92.2

EPS:GAAP $0.16 - $0.19 $1.02 - $1.09Adjusted2 $0 31 - $0 35 $1 60 - $1 68Adjusted $0.31 - $0.35 $1.60 - $1.68

Adjusted EBITDA3 $31.0 - $34.0 $164.0 - $170.0

Fully Diluted Wtd Avg Shares Outstanding 54.2 million 55 million

25

1 Pro forma for the acquisition of Apex Systems and the divestiture of the Nurse Travel Division2 Adjusted Net Income is GAAP-based net income adjusted for amortization expense of identifiable intangible assets, cash tax savings on indefinite-lived intangible assets and excess capital expenditure over depreciation, net of tax3 Adjusted EBITDA presented is one of the non-GAAP financial measures used by the Company and is defined by EBITDA adjusted for equity-based compensation expense, impairment charges, and acquisition related expenses, which terms might not be calculated in the same manner as, and thus might not be comparable to, similarly titled measures reported by other companies and other one-time items. Refer to Appendix for EBITDA reconciliation

Calculation of Adjusted EPS($ in thousands, except per share amounts) Q1 2013 FY 2013($ , p p )

Low High Low High

Net Income - GAAP Basis 8,800$ 10,500$ 56,000$ 60,000$

Add-back for:Amortization expense of identifiable intangible assets 5 400 5 400 21 000 21 000

Q 0 3 0 3

Amortization expense of identifiable intangible assets 5,400 5,400 21,000 21,000

Cash tax savings on indefinite-lived intangible assets(Goodwill & Trademarks) 3,850 3,850 15,400 15,400

Less:Excess capital expenditures over depreciation, net of tax (1,050) (1,050) (4,200) (4,200)Excess capital expenditures over depreciation, net of tax (1,050) (1,050) (4,200) (4,200)

Net Income - As Adjusted 17,000$ 18,700$ 88,200$ 92,200$

Earnings Per Share:GAAP Basis 0.16$ 0.19$ 1.02$ 1.09$ As Adjusted 0.31$ 0.35$ 1.60$ 1.68$

Adjustments to GAAP EPS mainly relate to certain acquisition-related items• Amortization of identifiable assets (mainly customer relationships) related to acquisitions

Estimated 2013 amortization expense of $21 millionDeclines annually as assets are amortized on an accelerated basis

As Adjusted 0.31$ 0.35$ 1.60$ 1.68$

Declines annually as assets are amortized on an accelerated basis• Cash tax savings on indefinite-lived assets (goodwill & trademarks)

Assets are amortized for tax purposes but not for financial reporting purposesIndefinite-lived assets of $593 millionAnnual tax amortization is $39.5 million ($15.4 million tax effected)F GAAP th h t i f ll ff t b d f d t i i

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For GAAP purposes, the cash tax savings are fully offset by a deferred tax provision• Excess capital expenditures over depreciation is difference between estimated capital expenditures of $15.9 million for 2013 less

estimated book depreciation of $9.0 million, after tax• Analysis does not consider an add-back for equity-based compensation expense

On Assignment’s Strategic Growth Opportunities

Cyclical Stabilization and

Growth

• Temporary help penetration rate still below peak historical levels

• Labor markets indicate job recovery continues to strengthen, albeit at an anemic rate

• Companies will look to temporary staffing to meet cyclical recovery in demand

Secular Trends Will Favor On

Assignment

• Aging U.S. population may constrain supply of available workforce

• If implemented, healthcare reform should stimulate demand for staffing in the longterm

• On Assignment focuses on the highly-skilled component of the labor force, which

Numerous Areas of Opportunity for

Incremental

• Healthcare IT• Locum tenens• Clinical research

companies typically have the hardest time staffing

Revenues

Acquisition Environment Is

F bl

C ca esea c• Permanent placement

• On Assignment is well positioned to enhance its market position and/or add newcapabilities / service offerings once acquisition stabilization has been completed

L b i t d i k d l i i th i iti f A S tFavorable

Significant Sources of EPS

• Low borrowing costs and quick deleveraging since the acquisition of Apex Systemsallow for an acquisition strategy to be redeployed

• Revenue growth vs. fixed costs creates margin opportunity

• Strong cash flow generation provides liquidity for rapid deleveragingSources of EPS Leverage

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• 338(h)(10) elections yield approximately $19 million in annual cash tax savings1

1 Represents combined estimated cash tax shields from elections associated with the acquisitions of Apex, Oxford, and HealthCare Partners

Key Investment Highlights

• Large and Growing Provider of Professional Staffing Services

• Strategically Positioned to Capture Favorable Trends inStrategically Positioned to Capture Favorable Trends in Professional Staffing

• Differentiated Platform Featuring High-end and Mission Critical g gSkill Sets

• Established Domestic Footprint With Significant Scale

• Experienced Management Team With a Proven Track Record to Execute On Assignment’s Growth

• Attractive Financial Characteristics – Strong Revenue and Substantial Free Cash Flow Generation

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