William H. Jefferys

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William H. Jefferys
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William H. Jefferys

William H. (Bill) Jefferys (born 1940) is an American astronomer and a professor emeritus of astronomy at The University of Texas at Austin.

He specialized in astrometry, celestial mechanics and astrophysics, including the kinematics and dynamics of astronomical bodies. He has also worked in the field of Bayesian statistics, particularly with astronomical applications.

Jefferys was the Hubble Space Telescope Astrometry Science Team leader, and participated in the project that repaired the Hubble Space Telescope after the discovery of its initial optical defect.

Jefferys served as chairman of The University of Texas Department of Astronomy from 1994 to 1998. He retired in 2004 and moved to Vermont in 2005. He was appointed an adjunct professor of statistics at the University of Vermont in 2005.

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