Since leaving Congress after 26 years, which included service as Chairman of the House Armed Services Committee, Mac continues to work at the intersection of technology and national security with various companies and organizations.

Mac led in creating the National Nuclear Security Administration to improve management of the nation’s nuclear weapons complex; establishing the Department of Homeland Security (introducing a bill to do so six months before the attacks of 9/11); preparing the military to defend the nation in new domains of warfare such as space and cyber; and improving DOD’s innovation and acquisition efforts.

In addition to serving on the House Armed Services Committee throughout his time in Congress, Mac also served on the House Intelligence Committee for 14 years. He has written widely on defense matters and appeared on all major television channels providing insight on national security-related issues.