Eugene Shoemaker was just 34 when he broke ground on Building One. At the time, he was the chief of the USGS Branch of Astrogeology. He would go on to a celebrated career, helping to firmly establish the new science of Astrogeology.  Though he maintained an office in Building One throughout much of his career, he spent much of his time doing Astrogeology work at various field locations on the Colorado Plateau, including Meteor Crater. He helped to establish conclusively that Meteor Crater was the result of a meteor impact. He worked extensively with the Apollo program, helping to train astronauts in the use of geologic tools to be used on the moon. For three years beginning in 1969, he lived in Los Angeles, where he chaired the Geology Department at the California Institute of Technology.  Later in his career, he returned to Flagstaff, though he frequently traveled to California's Palomar observatory and other scientific centers around the world. Working with his wife, Carolyn, he helped to discover 32 comets, a record-setting accomplishment. He is best known for helping to discover Shoemaker-Levy 9, which plunged into Jupiter in 1994. Shoemaker died in 1997, while traveling in Australia. In honor of Shoemaker's achievements, a vial carrying an ounce of his ashes was sent to the moon aboard the Lunar Prospector in 1999. The highlights of Shoemaker's career are recounted in Shoemaker -- the Man who Made an Impact by David H. Levy.