Gary T. Horowitz (born April 14, 1955 in Washington, D.C. is an American theoretical physicist who works on string theory and quantum gravity.
Horowitz studied at Princeton University (Bachelor 1976) and obtained his Ph.D. in 1979 at the University of Chicago with Robert Geroch. Subsequently he was a post-doc at the University of California, Santa Barbara and Oxford University (as a NATO Fellow). In 1981-1983 he worked as an Einstein Fellow at the Institute for Advanced Study. He became an Assistant Professor in 1983, Associate Professor in 1986, and finally Professor in 1990 at the University of California at Santa Barbara.
Horowitz investigates gravitational phenomena, such as black holes, in string theory. In the 1990s, he worked with, among others, Andrew Strominger and Joseph Polchinski showing that string theory provides a description of the quantum microstates of certain black holes (following earlier work of Strominger and Cumrun Vafa).
Source : Wikipedia (https://en.wikipedia.org/wiki/Gary_Horowitz)