Education and Development of Division C on Education, Outreach, and Heritage, of the International Astronomical Union. He was twice Chair of the Astronomy Division of the American Association for the Advancement of Science, and was on the astronomy committees of the American Astronomical Society (and its representative 2004–2013 to the AAAS), the American Physical Society, and the American Association of Physics Teachers. He was on the Council of Advisors of the Astronomy Education Review. He spearheaded a discussion of what should be taught in astronomy courses, championing the position of including and emphasizing contemporary astronomy. He was a Fellow of the American Physical Society, the International Planetarium Society, the American Association for the Advancement of Science, Committee for Skeptical Inquiry, and the Royal Astronomical Society, and he has held a Getty Fellowship. He was elected a Legacy Fellow of the American Astronomical Society in 2020. He lectured widely, including a stint as a Sigma Xi Distinguished Lecturer. He was also Director of the Hopkins Observatory and (in rotation, currently beginning in the fall semester of 2019) Chair of the Astronomy Department at Williams. Pasachoff was Chair of the Historical Astronomy Division of the American Astronomical Society (2013-2015). He was on the Organizing Committee for Commission C.C3 on the History of Astronomy of the International Astronomical Union (2015-2018) and on the Johannes Kepler Working Group. A catalogue of the Jay and Naomi Pasachoff rare-book collection—including works by Copernicus, Tycho, Galileo, Kepler, Newton, Fraunhofer, and Einstein—on deposit in the Chapin Library of Williams College (W. Hammond, 2014). Personal life In 1974, Pasachoff married Naomi (née Schwartz) in a Jewish ceremony. His wife. Dr. Naomi Pasachoff (1947–), is a writer and the daughter of economist Anna Schwartz. Their daughter, Eloise Pasachoff, is a research Professor of law at Georgetown Law. Selected publications The Sun, co-authored with Leon Golub (Reaktion Books, London, for the Science Museum, London, 2017) Cosmos: The Art and Science of the Universe, co-authored with Roberta J. M. Olson (Reaktion Books, London, and U. Chicago Books, Chicago, 2019) Peterson Field Guide to the Stars and Planets, 4th ed. 2021 update (Houghton Mifflin Harcourt, 2016) Peterson Field Guide to Weather with Jay Anderson and John A. Day (Houghton Mifflin Harcourt, 2021) The Cosmos: Astronomy in the New Millennium, co-authored with Alexei V. Filippenko (5th edition, Cambridge University Press, 2019), The Solar Corona, 2nd Edition, co-authored with Leon Golub (Cambridge University Press, 2010)