is executive vice president of corporate development and strategic
acquisitions. His most recent position was president and chief operating
officer for the Technical Services group. Before joining ManTech, Addeo
was chief operating officer of Serco NA, a subsidiary of Serco Group.
Before that, Addeo was the president of AT&T Government Solutions,
which provided business information technology and services solutions to
federal, civilian, defense and intelligence community customers. Addeo
served in a variety of leadership roles during his almost 30-year tenure