Dr. Leckrone began his NASA career in 1969 as an astrophysicist, working on the first Orbiting Astronomical Observatories at the Goddard Space Flight Center. In the early '70's he led studies of potential astronomical payloads for the Space Shuttle. In 1976 he was appointed Scientific Instruments Project Scientist for the Space Telescope Program (later re-named Hubble Space Telescope). Concurrently, in the 1980's, he was Head of the Astronomy Branch in the Laboratory for Astronomy and Solar Physics at Goddard. In 1992 he became Senior Project Scientist for the Hubble Program at GSFC. In this role he provides scientific leadership for all aspects of the Hubble Program and is scientific advisor to the HST Program Manager. He was the scientific lead for four highly successful Shuttle servicing missions to the HST in 1993, 1997, 1999 and 2002. In addition to his Hubble Program responsibilities, Dr. Leckrone also served as the Chief Scientist for the NASA Engineering and Safety Center (NESC), formed by the Agency in response to therecommendations of the Columbia Accident Investigation Board, during 2003-2005. Dr. Leckrone is an internationally recognized authority on ultraviolet astronomy, spectroscopic analysis of the atmospheres of stars, atomic spectroscopic data and theabundances of the chemical elements. He is the author or co-author of over 70 scientific papers and invited reviews, many of which are based on his research with the OAO satellites, with the International Ultraviolet Explorer and with the Goddard High Resolution Spectrograph on Hubble. He has worked extensively in public outreach and with the news media, including many interviews on national television and radio, and innumerable "popular" scientific talks at conventions and other public gatherings.