John M. Dionisio

Who is John M. Dionisio?

John M. Dionisio leads AECOM, an $8-billion global provider of professional technical and management support services, as Chief Executive Officer from 2005 to 2011. He served as chairman of the company's board of directors from 2011 to 2014, becoming executive chairman in 2014.

Prior to being appointed Chairman, Mr. Dionisio served as Chief Executive Officer and President for AECOM commencing in 2005. Before this, he served as Executive Vice President and Chief Operating Officer, and earlier as the Chief Executive Officer and President of AECOM legacy operating company DMJM Harris.

Under Mr. Dionisio's leadership as CEO, AECOM has tripled its revenue and doubled its workforce, while considerably expanding its service offerings and geographic reach. During 2007, Mr. Dionisio oversaw the company's initial public offering on the New York Stock Exchange, which was one of the 10 largest NYSE listings for 2007, and one of the largest engineering industry IPOs of all time.

During Mr. Dionisio's 35-plus-year career at AECOM, he oversaw the combination of three AECOM business units — Frederic R.