Mr. Darby joined the ManTech Board of Directors in September 2022.

Mr. Darby is a nearly 39-year veteran of the U.S. Intelligence Community, primarily the National Security Agency (NSA)/Central Security Service (CSS), culminating in serving over four years as the NSA/CSS Director of Operations (DO).

Prior to assuming the DO position, which oversees all of NSA’s collection, code-breaking, analysis and production of signals intelligence (SIGINT), Mr. Darby led some of NSA’s most difficult missions, including Counterterrorism, Cybersecurity Operations, and SIGINT analysis and production on all geographic and transnational missions. He managed a budget in the billions, drove development and use of advanced technologies, and in multiple positions led thousands of globally distributed civilian and military personnel providing intelligence support for military, diplomatic, cybersecurity and law enforcement operations.

Mr. Darby began his career as a Russian language analyst and served in a variety of field and operations management positions at NSA and abroad. He spent over a decade following 9/11 leading NSA’s counterterrorism and counterproliferation missions. Other key senior leadership assignments include serving as NSA’s Chief of SIGINT Analysis and the Deputy Chief of Cybersecurity Operations.

Mr. Darby received a Bachelor of Arts degree in Political Science/International Relations with a concentration in Russian Studies from Carleton College.