William Sheehan has written many books on astronomy, including: Planets and Perception (1988), The Immortal Fire Within: the life and work of Edward Emerson Barnard (1995), The Planet Mars (1996), In Search of Planet Vulcan (with Richard Baum; 1997), Epic Moon (with Thomas Dobbins; 2001), and Transits of Venus (with John Westfall; 2004). He is a consultant to the International Astronomical Union's Working Group on Planetary System Nomenclature, a Special Research Fellow in history of astronomy at the Lowell Observatory, a contributing editor to Sky & Telescope magazine and an Honorary Fellow of the Royal Astronomical Society of Canada. He is also past fellow of the John Simon Guggenheim Memorial Foundation, and a recipient of the Gold Medal of the Oriental Astronomical Association. Asteroid no. 16037 has been named Sheehan in his honor by the I.A.U.

With Springer, he has published a translation of James Lequeux's biography of the French astronomer U.J.J. Leverrier:Le Verrier-Magnificent and Detestable Astronomer (with Bernard Sheehan; 2013); Galactic Encounters (with Chris Conselice; 2014); and a translation of Camille Flammarion's The Planet Mars (with the late Sir Patrick Moore; 2014).

Professionally, William Sheehan is a psychiatrist. He is married, with two sons. He divides his time between his psychiatric and astronomical activities and between homes in Willmar, Minnesota and Flagstaff, Arizona. Among Sheehan's most recent observations have been those of Venus's atmosphere made at Lowell Observatory, during the transit of Venus of June 5-6, 2012, as a member of the international Venus Twilight Experiment.

For most of his life a denizen of the Bay Area, Dr. Westfall majored in geography at the University of California, Berkeley (BA 1960) and the George Washington University (MA 1964, PhD 1969). Employed by the (then) Coast and Geodetic Survey from 1961-64, he joined the faculty of San Francisco State University's Department of Geography and Human Environmental Studies in 1968, teaching courses in quantitative and historical geography and remote sensing, retiring in 2005.

Dr. Westfall's interest in astronomy dates back to the late 1940s, when he joined the Eastbay Astronomical Society, becoming a member of the Association of Lunar and Planetary Observers (ALPO) in 1953. He currently serves on the ALPO board of directors and is the coordinator of its Mercury/Venus Transit Section and an assistant coordinator in its Jupiter Section (Galilean satellite events). He has authored the book Atlas of the Lunar Terminator (Cambridge) and coauthored Transits of Venus (Prometheus) with William Sheehan. He has chased 12 total solar eclipses, three annular eclipses and three planetary transits (plus two from home). Dr. Westfall currently observes lunar eclipses, asteroid occultations of stars, and Jupiter satellite eclipses from his backyard in the relatively clear skies of Antioch, his favorite telescopesbeing a C14 and a C5.