$ 985 million (FY 2015)

CDI Corporation is a multinational company providing engineering, information technology and staffing services to clients in a range of industries including energy, chemical, aerospace, defense, transportation and financial services. The company employs 900 staffers and approximately 7,500 billable employees, and is headquartered in Philadelphia, PA.

CDI Corporation was founded in Philadelphia in 1950 as Comprehensive Designers, Inc. The company provided temporary technical services to manufacturing industries, including servicing the growing automotive and defense industries. In 1956, Walter R. Garrison, an engineer with Boeing, joined the company as its Chief Engineer. In 1961, Garrison and two colleagues bought the company, and Garrison became CEO.

In 1972, the company diversified into the field of job placement by buying Management Recruiters International, a firm that focused on providing permanent management talent for clients.

In 1973, Comprehensive Designers, Inc. changed their name to CDI Corporation.

In 1991, the company began further diversification into temporary staffing services of clerical and unskilled workers by acquiring temporary placement agency Today's Staffing.

By the end of 1994, the company reported over $1B in revenue in the three core areas of technical services, temporary services and Management Recruiters, with approximately 3,000 customers.

In March 1997, the company elected Mitch Wienick to the position of CEO and President, to replace the retiring Walter Garrison. Garrison remained on the company's board of directors. In 1999, CDI purchased executive headhunting firm Humana International, further expanding its mid-level management search and recruitment services through the addition of Humana's 136 franchised offices in Europe and Asia.

In 2001, Mitch Wienick announced his retirement and Roger H. Ballou was elected as CDI's new president and CEO.

In 2003, CDI announced the acquisition of AndersElite, a United Kingdom-based provider of building and construction professionals on a permanent and temporary basis.

In September 2007, the company announced the sale of Today's Staffing to Spherion for $40M.

In July 2010, the company announced the acquisition of L. Robert Kimball & Associates, Inc. (L.R. Kimball), a 550-person professional services firm that provided architecture, civil and environmental engineering, communication technology and consulting services. The firm was integrated into what was then called CDI Engineering Solutions.

In 2011, Paulett Eberhart, a veteran of Electronic Data Systems, was announced as CDI's new President and CEO, replacing the retiring Roger Ballou.

In August 2014, the company announced a new CEO, former Investcorp, Sears and Lehman Brothers executive Scott J. Freidheim.

In October 2015, CDI acquired Boston, Massachusetts-based EdgeRock Technologies LLC, a private IT staffing company, for $30 Million.

In September 2016, CEO Scott Freidheim resigned, and chief financial officer Michael Castleman was promoted to president and interim CEO.

CDI Corporation operates with three business units: Global Engineering and Technology Services (GETS), Professional Staffing Services (PSS) and Management Recruiters International (MRI).

CDI was named #25 on ENR.com's list of the top 500 Engineering design firms. CDI was selected as the 2013 Outsourcer of the Year by HDI, a professional association and certification body for technical service and support professionals. CDI was honored for "its commitment to excellence, efficiency and service quality." CDI's Virginia security team was honored by the Department of Defense with the James S. Cogswell award for providing Outstanding Industrial Security.