An American economist, who was accused by Elizabeth Bentley in the 1940s of spying for the Soviet Union during World War II. Born in Springfield, Missouri in 1908, Ullmann graduated from Harvard Business School with an M.B.A. in 1935 and then went to Washington, D.C. to work for the government in the National Recovery Administration. In 1939, he was hired at the Division of Monetary Research in the U.S. Department of the Treasury, and by 1941 he became an administrative assistant to Harry Dexter White.
In 1942 Ullmann was drafted, commissioned in the Army Air Force and assigned to the Pentagon with the rank of a Major. After his discharge in 1943, he returned to the Treasury Department. He was a member of the U.S. delegation to the United Nations Charter Conference in San Francisco in 1945. He resigned from the Treasury on March 21, 1947 and later became a successful building contractor in New Jersey, together with his long-time friend and associate in Soviet intelligence work, Nathan Gregory Silvermaster.