Andrei Dmitrievich Sakharov (May 21, 1921 – December 14, 1989) was a Soviet nuclear physicist and human rights activist. Born in Moscow to Dmitri Ivanovich Sakharov, a distinguished scientist, author on scientific pedagogy, and amateur pianist, he was tutored at home until entering school in 1933. Demonstrating early talent in theoretical physics, he enrolled in the physics department of Moscow State University in 1938 and earned a doctorate in 1945. From 1948, under Nobel laureate Igor Tamm, he contributed significantly to the Soviet hydrogen bomb project, becoming known as one of the key developers of thermonuclear weapons. In the 1960s, Sakharov shifted focus toward human rights and disarmament, authoring influential essays like 'Reflections on Progress, Peaceful Coexistence, and Intellectual Freedom' in 1968, which led to his expulsion from classified work. His activism intensified, resulting in internal exile to Gorky (Nizhny Novgorod) from 1980 to 1986. Awarded the Nobel Peace Prize in 1975 for his global human rights advocacy, he continued criticizing Soviet policies through Western media contacts despite personal hardships, including sentences against associates like Sergei Kovalev and Andrei Tverdokhlebov. Elected to the Soviet Congress of People's Deputies in 1989, he died in Moscow.