Mr. Thomas Paul D’Agostino was sworn in on August 30, 2007, as the Under Secretary for Nuclear Security and Administrator of the National Nuclear Security Administration (NNSA). On September 3, 2009, President Obama announced that Mr. D’Agostino was his choice to continue serving as the Under Secretary for Nuclear Security and NNSA Administrator. The NNSA plays a critical role in ensuring the security of our Nation by maintaining the safety, security, and effectiveness of the U.S. nuclear weapons stockpile without nuclear testing; reducing the global danger from the proliferation of nuclear weapons and materials; providing the U.S. Navy with safe and effective nuclear propulsion; and providing the Nation with an effective nuclear counterterrorism and incident response capability. From February 2006 to August 2007, Mr. D’Agostino served as the Deputy Administrator for Defense Programs and directed the Stockpile Stewardship Program and major elements of the NNSA’s Nuclear Security Enterprise. The Nuclear Security Enterprise includes three national research laboratories, four production plants, and the Nevada Test Site. The Stockpile Stewardship Program employs more than 25,000 people around the country and encompasses operations associated with manufacturing, maintaining, refurbishing, and dismantling the nuclear weapons stockpile.
Prior to his appointments to the above Presidentially-appointed Senate confirmed positions, Mr. D’Agostino was the Assistant Deputy Administrator for Program Integration where he supported the Deputy Administrator and directed the formulation of the programs, plans, and budget for the Stockpile Stewardship Program. He had also served as the Deputy Director for the Nuclear Weapons Research, Development, and Simulation Program where he directed the formulation of the programs and budget for the research and development program that supports the Stockpile Stewardship Program. Mr. D’Agostino also worked in numerous assignments within the Federal Government including the start-up of the Department's tritium production reactors and at the Naval Sea Systems Command as a program manager for the SEAWOLF submarine propulsion system. Mr. D’Agostino achieved the rank of Captain in the U.S. Naval Reserves where he served with the Navy Inspector General and with the Deputy Chief of Naval Operations for Submarine Warfare in developing concepts for new attack submarine propulsion systems. He also served with the Deputy Chief of Naval Operations for Plans, Policy, and Operations (N3/5) in the Navy Command Center in the Pentagon. In this capacity, he was the French Desk Officer for the Chief of Naval Operations responsible for all Politico-Military interactions with the French Navy and served as the Duty Captain at the Navy Command Center. He spent more than eight years on active duty in the Navy as a submarine officer, including assignments onboard the USS SKIPJACK (SSN 585) and with the Board of Inspection and Survey where he was the Main Propulsion and Nuclear Reactor Inspector. In this position, he performed nuclear reactor and propulsion engineering inspections for more than 65 submarines and nuclear-powered ships in the Atlantic and Pacific Fleets. Mr. D’Agostino's awards include: Presidential Rank Meritorious Executive Award; Navy Commendation Medal with Gold Stars; Navy Achievement Medal; Navy Expeditionary Medal; Meritorious Unit Commendation; and, National Defense Service Medal. Mr. D’Agostino is married to Beth Ann Alemany of Manchester, CT, and has two children. Education:
 Naval War College, Newport, RI, MS National Security Studies, 1997 (Distinguished Graduate) 
Johns Hopkins University, Baltimore, MD, MS Business Finance, 1992 
United States Naval Academy, Annapolis, MD, BS Physical Science, 1980.