Hans C. Ohanian received his B.S. from the University of California, Berkeley, and his Ph.D. from Princeton University, where he worked with John A. Wheeler. He has taught at Rensselaer Polytechnic Institute, Union College, and the University of Vermont. He is the author of several textbooks spanning all undergraduate levels: Physics, Principles of Physics, Relativity: A Modern Introduction, Modern Physics, Principles of Quantum Mechanics, Classical Electrodynamics, and, with Remo Ruffini, Gravitation and Spacetime. He is also the author of dozens of articles dealing with gravitation, relativity, and quantum theory, including many articles on fundamental physics published in the American Journal of Physics, where he served as associate editor for some years. He lives in Vermont.

Remo Ruffini is the Chair of Theoretical Physics at the University of Rome, where he received his Ph. D., and has also taught at Princeton University. He is an editor of the International Journal of Modern Physics and has acted as an adviser to NASA and the Italian Space Agency. In addition to Gravitation and Spacetime, a partial listing of his published works include Cosmology from Space Platforms, Black Holes, Gravitational Waves and Cosmology, Basic Concepts in Relativistic Astrophysics, Gamow Cosmology, and various articles and edited volumes.

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