class of 1941, and completed her internship at St. Elizabeths Hospital in Washington, D.C., and residency at the Department of Psychiatry at Mount Zion Hospital (now the University of California, San Francisco Medical Center) in San Francisco. Romance with Oppenheimer Tatlock struggled with her sexuality, at one point writing to a friend that "there was a period when I thought I was homosexual. I still am, in a way, forced to believe it, but really, logically, I am sure that I can't be because of my un-masculinity." She began seeing Robert Oppenheimer in 1936, when she was a graduate student there and Oppenheimer was a professor of physics at Berkeley. They met through his landlady, Mary Ellen Washburn, who was also a member of the Communist Party, when Washburn held a fund raiser for communist-backed Spanish Republicans. The couple started dating and had a passionate relationship; he proposed to her twice, but she refused. She is credited with introducing Oppenheimer to radical politics during the late 1930s, and to people involved with, or sympathetic to the Communist Party or related groups, such as Rudy Lambert and Thomas Addis. They continued seeing each other after he became involved with Kitty Harrison, whom he married on November 1, 1940. Oppenheimer and Tatlock spent the New Year together in 1941, and once met at Mark Hopkins hotel in San Francisco. Oppenheimer's association with her friends was used as evidence against him during his 1954 security hearing. In a letter to Major General Kenneth D. Nichols, General Manager, United States Atomic Energy Commission, dated March 4, 1954, Oppenheimer described their association as follows: While some historians believe that Oppenheimer had an extramarital affair with Tatlock while he was working on the Manhattan Project, others assert he met with Tatlock only once after he was picked to head the Los Alamos Laboratory in mid-June 1943. On June 14, 1943, Oppenheimer was in Berkeley to recruit David Hawkins as an administrative assistant. They went to a Mexican restaurant in her green 1935 Plymouth coupe, and spent the night together at her San Francisco apartment at 1405 Montgomery Street. All the while, U.S. Army agents, waiting in the street outside, had them under surveillance. At that meeting she told him that she still loved him and wanted to be with him. He never saw her again. Despite her relationship with Oppenheimer, in Edith Arnstein Jenkins' memoir, she