Leonard Susskind has been the Felix Bloch Professor in Theoretical Physics at Stanford University since 1978. The author of The Black Hole War and The Cosmic Landscape, he lives in Palo Alto, California. He is widely considered to be one of the fathers of string theory.
George Hrabovsky is the president of Madison Area Science and Technology (MAST), a nonprofit organization dedicated to scientific and technological research and education. He lives in Madison, Wisconsin.