I should not give the impression that it was wholly because of Jean Tatlock that I made leftwing friends, or felt sympathy for causes which hitherto would have seemed so remote from me, like the Loyalist cause in Spain, and the organization of migratory workers.
While some historians believe that Oppenheimer had an extramarital affair with Tatlock while he was working on the Manhattan Project,[REF] others assert he met with Tatlock only once after he was picked to head the Los Alamos Laboratory in mid-June 1943 [REF].