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Dr. Hart is the author of "The 100: A Ranking of the Most Influential Persons in History" (1978, Hart Publishing Company; revised edition, 1992, Citadel Press). He is also co-editor (and part author) of the anthology "Extraterrestrials: Where Are They?" (1982, Pergamon Press; revised edition, 1995, Cambridge University Press). In addition, he has published a variety of technical articles in scientific journals.
Dr. Hart was for many years a college professor. He taught courses in astronomy, in physics, and in the history of science. He is now a full-time writer.
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