William Hamilton Jefferys III (born 1940) is an American astronomer.
Jefferys specialized in astrometry, celestial mechanics, and astrophysics, including the kinematics and dynamics of astronomical bodies.
He 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.
You can help Wikipedia by expanding it.This article about a statistician from the United States is a stub.