Thomas Cremins has worked in a range of critical and leading edge governmental and executive assignments for NASA. Before that, he was director of the legislative liaison division. Between September 2008 and December 2010, he was director of the studies and analysis division. In 2010, as a fellow on the senate commerce committee, he played an instrumental role in the development and passage of the 2010 NASA Authorization Act. Before these assignments, Cremins was the deputy associate administrator, management and policy, exploration systems mission directorate. He was responsible for the development and integration of strategy, international and commercial partnerships, resources and organizational development. From 2002-2004, he served as the assistant associate administrator, assets and investments, NASA space operations mission directorate. 
Before joining NASA in 1993, Cremins worked in the office of the secretary of the Department of Energy (DOE), office of space.