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.