John 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. He earned a master of science degree in civil engineering from New York University Tandon School of Engineering.