Previously, Tom served as NASA’s Cryosphere Program Scientist in the Earth Science Division at NASA Headquarters. In this role, he directed NASA activities for the Earth’s polar regions and global cryosphere. He was the Program Scientist for development and launch of NASA’s ICESat-2, a space-based lidar currently characterizing the changing heights of global ice and forest cover, as well as designing and overseeing the decade-long Operation IceBridge mission, the largest aircraft survey of the Earth’s polar ice sheets ever flown. Tom also developed and ran various research programs focused on the Arctic and Antarctic, remote sensing, climate change, sea level rise, weather, and water resources. He served as the NASA Staff Representative to the Interagency Arctic Research Policy Committee at the Whitehouse’s Office of Science and Technology Policy and helped author the US Arctic Research Plan: 2013-2017.