Hillen continues to serve as vice chairman of Sotera’s board of advisers and as chairman of the Professional Services Council’s board of directors, SOSi said Monday.
His private sector career includes service as president of CGI Federal (NYSE: GIB) and earlier as head of the defense and intelligence business at American Management Systems, which CACI International (NYSE: CACI) acquired in 2004.
Before joining AMS, he served as chief operating officer of New York-based financial services company Island ECN.
Prior to Sotera, he served as assistant secretary of state for political-military affairs between 2005 and 2007.
In that role, he was responsible for coordinating U.S. diplomatic strategy with military operations and also oversaw the department’s policies on international security, security assistance, defense trade, military operations, weapons removal and abatement.