Vann H. Van Diepen is an independent consultant, including on the rolls of Duco Experts. He was been principal deputy assistant secretary of state for international security and non-proliferation (ISN) since June 2009, including over two years as acting assistant secretary. From February 2006 to June 2009, he was national intelligence officer for weapons of mass destruction and proliferation in the Office of the Director of National Intelligence. From July 1991 to February 2006, he was an office director in ISN and its predecessor bureaus, overseeing policy for the non-proliferation of missiles as well as chemical and biological weapons. From December 1989 to July 1991 he analyzed East-West arms control issues in the State Department’s Political-Military Bureau. He served in the State Department’s Bureau of Intelligence and Research analyzing Soviet and other non-U.S. strategic forces from November 1982 to December 1989. He received a B.A. in international studies from The American University in 1981, and an S.M. from the Massachusetts Institute of Technology Defense and Arms Controls Studies program in 1983. In the fall of 2016, he received the Senior Executive Service Presidential Rank Award of Distinguished Career Executive.