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Christopher Chyba is professor of astrophysical sciences and international affairs at Princeton University. His security-related research emphasizes nuclear and biological weapons policy, arms control, and nonproliferation. His scientific research focuses on solar system exploration and the search for life elsewhere. Chyba directed Princeton’s Program on Science and Global Security from 2006 to 2016. Prior to coming to Princeton, Chyba was associate professor of geological and environmental sciences at Stanford University, where he also co-directed Stanford's Center for International Security and Cooperation (CISAC), and held the Carl Sagan Chair at the SETI Institute.

Chyba served on the White House staff from 1993-1995, entering as a White House Fellow, serving on the National Security Council staff, and then in the National Security Division of the Office of Science and Technology Policy. In 1996, Chyba received the Presidential Early Career Award for Scientists and Engineers. In 2001, he was named a MacArthur Fellow for his work in both international security and planetary science.

Chyba has served on the National Çï¿ûÊÓƵ of Sciences' Committee for International Security and Arms Control, is past chair of the National Research Council’s Committee on Preventing the Forward Contamination of Mars, and past member of the National Çï¿ûÊÓƵ’s Committee on Advances in Technology and the Prevention of Their Application to Next Generation Biowarfare Threats. He served on the executive committee of NASA's Space Science Advisory Committee, for which he chaired the Solar System Exploration Subcommittee, and chaired the Science Definition Team for NASA’s Europa Orbiter mission.