ManTech International Corporation Announces Resignation of Terrence M. Ryan as President and Chief Operating Officer of the Emerging Markets Group, Effective February 1, 2013

ManTech International Corporation announced that On January 18, 2013, Mr. Terrence M. Ryan, President and Chief Operating Officer of one of the company's business groups, the Emerging Markets Group provided notice of his decision to resign from his position with the company. The effective date of Mr. Ryan's resignation is February 1, 2013.