George Petros Efstathiou (; born 2 September 1955) is a British astrophysicist who was Professor of Astrophysics at the University of Cambridge from 1997 to 2022, where he was also the first director of the Kavli Institute for Cosmology from 2008 to 2016. Prior to these appointments he was Savilian Professor of Astronomy at the University of...
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