Mr. James Mazol is currently Performing The Duties Of (PTDO) Deputy Under Secretary of Defense (Research and Engineering).

Mr. Mazol previously performed the duties of the Under Secretary of Defense for Research and Engineering (OUSD(R&E)) and Chief Technology Officer. Prior to assuming those duties, he served as the Republican Policy Director for the Senate Armed Services Committee with responsibility for science and technology policy and programs. A Capitol Hill veteran, Mazol also served as the Republican Policy Director for the Senate Commerce, Science, and Transportation Committee; National Security Advisor for Senator Roger F. Wicker (R-Miss.); and Legislative Director for former Congressman Jim Bridenstine (R-Okla.).