Alexander Beilinson is a prominent mathematician known for his contributions to several areas, including algebraic geometry, representation theory, and mathematical physics. He was born on December 18, 1955, in Leningrad, Russia, and later moved to the United States, where he has worked at various prestigious institutions. Beilinson is particularly recognized for his work on sheaf theory and derived categories, which have had a significant impact on modern mathematics. He has also collaborated with other mathematicians, such as Vladimir Drinfeld, to develop important concepts in number theory and quantum field theory.