At the invitation of
John N. Bahcall, Spergel joined the
Institute for Advanced Studies after his
PhD. He left and moved to
Princeton University in 1987 as an
assistant professor. He was promoted to
associate professor in 1992 and
full professor in 1997. In 2007, he was appointed the
Charles A. Young Professor of Astronomy on the Class of 1897 Foundation. Citing the hesitance to hold onto 2 positions, Spergel is a 2001
MacArthur Fellow, He was the
Keck Distinguished Visiting Professor at the
Institute for Advanced Study from 2000 to 2001. Currently, he is a member of the
Simons Observatory, chairs the Science Definition Team of the
Nancy Grace Roman Space Telescope (formerly known as the Wide-Field Infrared Survey Telescope), and sits on the Board of Trustees of the
Carnegie Institution for Science (since 2022). In 2022, Spergel was invited to lead
NASA's UAP independent study team of sixteen members to provide guidance in better understanding "unidentified anomalous phenomena". == Honors and awards ==