Hans Ohanian studied physics at Berkeley and at Princeton, where he worked on relativity with John A. Wheeler. He has taught at Rensselaer Polytechnic Institute, Union College, the University of Rome, and the University of Vermont. He is the author of several physics textbooks and dozens of articles dealing with relativity, gravitation, and quantum theory, including many articles on fundamental physics published in the American Journal of Physics, where he served as associate editor for several years. Of late, he has become interested in the ecological and economic aspects of renewable energy systems in Vermont, where he lives. His favorite renewable system is his sailboat "ARCHIMEDES," on which he cruises on Lake Champlain.