Vann Van Diepen

Vann Van Diepen is a former United States civil servant who worked in a variety of positions in the United States Department of State.

Van Diepen received a B.A. degree in international studies from American University and a S.M. degree from the Massachusetts Institute of Technology. He began his career in the Bureau of Intelligence and Research as a Soviet military analyst, and later held positions managing chemical and biological weapons nonproliferation initiatives, and ballistic missile threat reduction programs, for the U.S. State Department. The charges of politicization against Van Diepen and the other report authors were rejected by Vice President of the United States Dick Cheney and by Flynt Leverett. While acting as Assistant Secretary of State he confronted Ukrainian officials over allegations they had been supplying South Sudan with T-72 main battle tanks which, according to diplomatic cables, led to a "commotion on the Ukrainian side".

In 2016 Van Diepen was decorated with the Presidential Rank Award of Distinguished Senior Professional. He retired from the State Department in December 2016.