AECOM Technology Corp. named John M. Dionisio chairman of the board of directors, succeeding Richard G. Newman, effective Oct. 1, 2011. Dionisio will continue to serve as CEO of AECOM.

Dionisio, who has served as president/CEO since 2005, has been with the company since 1971. Newman will continue to serve as a member of AECOM's board of directors, in the role of chairman emeritus.

Since 2005, AECOM has grown its annual gross revenue from $2.4 billion to approximately $7 billion, increased its workforce from nearly 28,000 to approximately 45,000 employees and expanded its global footprint to more than 125 countries. The company has also completed more than 30 acquisitions.

The company also announced that Michael S. Burke has been appointed president, and Jane A. Chmielinski has been appointed chief operating officer and president of the Americas, effective Oct. 1, 2011. Burke, who joined the company in 2005, was named chief financial officer in 2006. Chmielinski joined the company in 1993 and has served as executive vice president in charge of Americas operations and chief corporate officer, since 2009.

Additionally, Stephen M. Kadenacy, who joined AECOM in 2008 as senior vice president, finance, will succeed Burke as executive vice president and CFO.