Saul Rappaport is a professor emeritus[1] of physics at the Massachusetts Institute of Technology. Rappaport became assistant professor in the MIT Department of Physics in 1969 and became a full professor in 1981. From 1993 to 1995, he was head of the Astrophysics Division.
His main research interest is in binary systems containing collapsed stars—white dwarfs, neutron stars[2] (including pulsars[3]), and black holes. He has authored numerous papers regarding the discovery of astronomical phenomena, such as the discovery of transiting exocomets[4] and the discovery of a quadruple star system containing two strongly interacting eclipsing binaries.[5]
He was elected a Fellow of the American Physical Society in 1989 "for major contributions to our understanding of the evolution of binary stellar systems containing a compact member and for the determination of the masses of neutron stars"[6]