How did Andrei Sakharov, a theoretical physicist and the acknowledged father of the Soviet hydrogen bomb, become a human rights activist and the first Russian to win the Nobel Peace Prize? In his later years, Sakharov noted in his diary that he was "simply a man with an unusual fate." To understand this deceptively straightforward statement by an extraordinary man, The World of Andrei Sakharov, the first authoritative study of Andrei Sakharov as a scientist as well as a public figure, relies on previously inaccessible documents, recently declassified archives, and personal accounts by Sakharov's friends and colleagues to examine the real context of Sakharov's life.