Jacob Bekenstein

Jacob David Bekenstein (May 1, 1947 – August 16, 2015) was a Mexican-born American-Israeli theoretical physicist whose foundational contributions to black hole thermodynamics revolutionized understandings of entropy and information in gravitational systems.

Born in Mexico City to Jewish parents, Bekenstein earned his bachelor's degree from the Polytechnic Institute of Brooklyn in 1969 and a Ph.D. from Princeton University in 1972 under John Archibald Wheeler, focusing on general relativity. He later joined the Hebrew University of Jerusalem as the Polack Professor of Theoretical Physics, where he spent much of his career advancing quantum gravity research.

Bekenstein's most significant achievement came in the early 1970s when he proposed that black holes possess entropy proportional to the area of their event horizons, resolving paradoxes in classical thermodynamics by treating horizons as information repositories rather than destroyers. This insight, initially met with skepticism, paved the way for Stephen Hawking's derivation of black hole evaporation and the now-standard Bekenstein-Hawking entropy formula, S = (k A)/(4 ħ G / c³), linking quantum mechanics, gravity, and thermodynamics.