Hans C. Ohanian received his BS from the University of California, Berkeley, and his PhD from Princeton University, where he worked with John A. Wheeler. He has taught at Rensselaer Polytechnic Institute, the University of Vermont, and in summer courses at UNED in Spain. He has published several textbooks in addition to Gravity and Spacetime, including Classical Electrodynamics and Principles of Quantum Mechanics, as well as articles on various aspects of relativity and quantum theory.