As an advisor to the United States Atomic Energy Commission (AEC), Oppenheimer's stance generates controversy, while Teller's hydrogen bomb receives renewed interest amidst the burgeoning Cold War. AEC Chairman Lewis Strauss resents Oppenheimer for publicly dismissing Strauss's concerns about exporting radioactive isotopes and for recommending negotiations with the Soviet Union after the Soviets successfully detonate their own bomb. Strauss also believes that Oppenheimer denigrated him during a conversation Oppenheimer had with Einstein in 1947.