In the late 1930s, he was a student at the International School of Geneva, Switzerland, where he befriended the portrait artist Milein Cosman.
[2] He subsequently graduated summa cum laude from Yale University in 1942.
Tenenbaum was a US First Lieutenant and intelligence officer with the Publicity and Psychological Warfare unit of the Twelfth Army Group headquarters under General Omar N. Bradley.
While in his early 20s,[3][5] he and civilian Egon W. Fleck were the first two non-captive Allied personnel to enter Buchenwald concentration camp on April 11, 1945,[6] at 5:30 p.m. After the war, Tenenbaum served as special assistant to Lucius D. Clay,[3] finance adviser of the U.S. military-established government from 1945 to 1948 and as an economist with the Economic Cooperation Administration from 1948 to 1950.
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