Subrahmanyan Chandrasekhar (October 19, 1910 - August 21, 1995) was an Indian-American astrophysicist. He was awarded, along with William A. Fowler, the 1983 Nobel Prize for Physics, with Chandrasekhar cited for his mathematical theory of the physical processes of importance to the structure and evolution of the stars. This work led to the currently accepted theory on the later evolutionary stages of massive stars, including black holes. He studied at Presidency College, Madras (now Chennai) and University of Cambridge. He spent most of his career at the University of Chicago, spending some time in its Yerkes Observatory, and serving as editor of The Astrophysical Journal from 1952 to 1971. He became a naturalized citizen of the United States in 1953. He served on the University of Chicago faculty from 1937 until his death in 1995 at the age of 84. No photographer credited, undated.