Steven J. Dick is the Chief Historian for NASA. He worked as an astronomer and historian of science at the U.S. Naval Observatory in Washington, DC, for 24 years before coming to NASA Headquarters in 2003. Among his most recent books are Critical Issues in the History of Spaceflight (2006 edited with Roger Launius), Risk and Exploration: Earth, Sea and the Stars (2005, edited with Keith Cowing), The Living Universe: NASA and the Development of Astrobiology (2004), and Sky and Ocean Joined: The U.S. Naval Observatory, 1830-2000 (2003). He is the recipient of the Navy Meritorious Civilian Service Medal and the NASA Group Achievement Award, and he is a member of the International Academy of Astronautics and the International Astronomical Union.