George Greenstein is the Sidney Dillon Professor of Astronomy at Amherst College, Massachusetts. He is an accomplished writer, having written one textbook, three books on science for the general public and numerous magazine articles. One of his books won both the American Institute of Physics/US Steel science-writing award and the Phi Beta Kappa Award in Science. Professor Greenstein is a recognized leader in the American Astronomical Society's effort to reform astronomy education in the United States. Some time ago he co-organized a series of workshops for department chairs of the most prestigious universities in the country, which led to a set of proposed goals for reform of introductory astronomy courses nationwide. Professor Greenstein's field of research interest is theoretical astrophysics.