Harold (Hal) Masursky (December 23, 1922* – August 24, 1990) was an American astrogeologist. After leaving Yale University without defending his dissertation, he started his career in the early 1950s as a field geologist in Wyoming and Colorado working for the United States Geological Survey (USGS). In the early 1960s, he moved to the Astrogeology division of the USGS and began working at NASA's Jet Propulsion Laboratory in Pasadena, California. In the mid 1960s, he moved to Flagstaff, Arizona as a founding planetary geologist at the newly-constructed USGS Astrogeology Science Center. Throughout his professional career with the USGS, his work contributed to the mission of NASA in the areas of economic, structural, and planetary geology. He was responsible for the investigation of planetary and lunar surfaces, especially in finding scientifically valuable landing places. This included for the Apollo program, where, in the 1960s, he played a major role in choosing landing sites and assisted in training astronauts in the basics of geology so they would know what to look for on the surface of the moon. In the 1970s, he headed the team that mapped the surface of Mars and was once again involved in choosing landing sites, this time for the Mars Viking missions. In the 1980s, he worked with the Voyager program to explore the surfaces of Jupiter, Saturn, Uranus, and Neptune. Masursky was a strong advocate for the exploration of Venus and he was a key member of Pioneer Venus Orbiter team. He worked on numerous other space missions and programs, including, for moon exploration, Ranger, Surveyor, the Lunar Orbiter, and the mapping of Mars by Mariner 9, as well as contributing to the missions of the Galileo and Magellan spacecraft. He was often interviewed on television as his enthusiasm for the planetary discoveries of the space missions was both edifying and infectious An especially key role was his work as the president of the Working Group for Planetary System Nomenclature of the International Astronomical Union (IAU). He created a small stir in 1986, when he was required to reject a popular suggestion that new moons of Uranus, discovered earlier that year, be named for the 7 astronauts lost in the Space Shuttle Challenger explosion - the IAU has strict guidlines that prohibit major bodies being named in honor of persons from a particular country. In 1985, Masursky was the recipient of the Distinguished Service Award, which