William T. Reach is an astronomer who has studied zodiacal light, cometary meteoroids, interstellar clouds, supernova remnants, and cosmic backgrounds. He took his bachelor s degree in physics from Cornell University, then his PhD in astronomy from University of California at Berkeley. His thesis, titled "Zodiacal Emission" addressed the infrared emission from interplanetary dust grains and detailed their spatial distribution including revealing that the Earth is trailed by a cloud of interplanetary dust that is part of a circumsolar dust ring. He held postdoctoral positions at NASA Goddard Space Flight Center (with the Cosmic Background Explorer team) in Maryland and the Institut d'Astrophysique Spatiale (with the Infrared Space Observatory team) in Paris. His main career positions were at Caltech (with the NASA Spitzer Space Telescope and ESA Planck projects) and at the Universities Space Research Association (with the U.S./German Stratospheric Observatory for Infrared Astronomy). Dr. Reach is now affiliated with the non-profit Space Science Institute, working from Redwood City, CA.