Dr. Williams is Astronomer Emeritus at Space Telescope Science Institute, having served as Director of the Institute from 1993-98. Prior to that time he spent eight years in Chile as Director of the Cerro Tololo Inter-American Observatory,
after having served as Professor of Astronomy at the University of Arizona/Tucson for 18 years. His research specialties include nebulae, novae, accretion disks, and emission-line spectroscopy and analysis.
Dr. Williams graduated from the U. California/Berkeley (A.B.) and U. Wisconsin (Ph.D.) with degrees in astronomy. In 1998 he was awarded the Beatrice Tinsley Prize of the American Astronomical Society for his leadership of the Hubble Deep Field project. He is a member of the American Academy of Arts & Sciences and has served as Vice President of the American Astronomical Society and President of the International Astronomical Union. He is a strong advocate for international collaborations that operate facilities that produce unique science data, both on ground and in space, and for multi-wavelength facilities and data archives.