Los Angeles — AECOM announced that its board of directors has appointed CEO Michael S. Burke to the additional position of chairman of the board. The appointment, effective March 4, completes a planned succession following the retirement of John M. Dionisio as executive chairman.

Burke, who was appointed CEO in March 2014, has overseen a major transformation of AECOM. Over the past 12 months, AECOM has more than doubled its revenue and the size of its workforce via several acquisitions, most notably URS Corp., and has dramatically accelerated its strategy to create an integrated-delivery platform with superior capabilities to design, build, finance and operate infrastructure assets around the world. In February 2015, for the first time in its history, the company was designated a Fortune World’s Most Admired Company.

Burke has served as a key AECOM leader since he joined the company in 2005 and has been instrumental in the evolution of AECOM from a private company with approximately 20,000 employees to a public company with nearly 100,000 employees. He was named chief financial officer in 2006 and, prior to his appointment as CEO last year, Burke had been president of the company since October 2011. He becomes AECOM’s fourth chairman in the company’s 25-year history.

Dionisio will remain a member of the board of directors.

“I would like to thank John Dionisio for his 43 years of service to this organization and his many contributions to the engineering industry,” said Burke. “I am grateful to him and to our board of directors for their leadership and also for the trust they are placing in me to execute against AECOM’s vision to be the premier fully integrated infrastructure firm in the world.”