Luke grew up in San Antonio, Texas and attended Harvard, where he majored in physics. He got his Ph.D. from the University of California, Berkeley. His thesis dealt with density waves in Saturn’s rings and the photometric properties of the rings as seen in Voyager images. He did a postdoc at NASA Ames Research Center in Silicon Valley and another postdoc at CITA in Toronto. He then returned to NASA Ames, where he worked on “soft money” for seven years. Since 1999 he has worked at the Boulder office of Southwest Research Institute, where he is currently a Principal Scientist.
Luke’s research interests are mainly focused in the outer solar system, particularly the orbital dynamics of comets, Kuiper Belt objects, and planetary satellites and rings, and the impact histories of icy satellites. He is a member of the Imaging Team of the Cassini mission to Saturn.