He earned a PhD in planetary geology at University College London, England.
He worked at the Lunar and Planetary Institute in Houston and the European Space Agency, before joining the Johns Hopkins University Applied Physics Laboratory and becoming a senior staff scientist at that facility.
He participated in the Near-Earth Asteroid Rendezvous-Shoemaker (NEAR) mission as a research scholar at Northwestern University.
[3] He has a particular interest in the lunar poles, using the Clementine images to locate crater cold traps for hydrogen deposits and mapping the peaks of eternal light.
The team was able to develop a map of the Moon's north pole, making it possible to identify the percentage of time that the surface is illuminated by the Sun during the Lunar day.