Dr. Pasachoff was the Field Memorial Professor of Astronomy and Director of Hopkins Observatory at Williams College in Williamstown, Massachusetts, U.S.A. His research involves planetary atmospheres, the interstellar medium, and solar physics. He observed many total solar eclipses while pursuing studies of the solar chromosphere and corona. Dr. Pasachoff has an international reputation for his contributions to education in astronomy. He is the author of many school- and university-level textbooks on science and introductory astronomy, plus astronomical field guides for the general public.