George Placzek was a Czech physicist.
George Placzek
Plaque at Placzek's place of birth in Brno
Edward Teller was a Hungarian-American theoretical physicist and chemical engineer who is known colloquially as "the father of the hydrogen bomb" and one of the creators of the Teller–Ulam design.
Teller in 1958
Teller in his youth
The Hungarian passport Teller carried when he entered the United States in 1935.
Teller's ID badge photo from Los Alamos