Frederic de Hoffmann assisted which Hungarian-American physicist in the development of the hydrogen bomb?
Frederic de Hoffmann:  Upon graduating, de Hoffmann was sent to Los Alamos National Laboratory where he assisted Edward Teller in the development of the Hydrogen bomb. Edward Teller: Edward Teller (Hungarian: "Teller Ede" ; January 15, 1908 – September 9, 2003) was a Hungarian-American theoretical physicist who was born in Hungary, and is known colloquially as "the father of the hydrogen bomb", although he claimed he did not care for the title.
Edward Teller