Geoffrey Colin Shephard is a mathematician who works on convex geometry and reflection groups. He asked Shephard's problem on the volumes of projected convex bodies, posed Shephard's conjecture on polyhedral nets, proved the Shephard–Todd theorem in invariant theory of finite groups, and classified the complex reflection groups.
Shephard earned his Ph.D. in 1954 from Cambridge University, under the supervision of J. A. Todd. He was a professor of mathematics at the University of East Anglia until his retirement.
- Grünbaum, Branko; Shephard, Geoffrey Colin (1987), Tilings and Patterns, New York: W. H. Freeman, ISBN 978-0-7167-1193-3, MR 857454
- McMullen, Peter; Shephard, Geoffrey Colin (1971), Convex Polytopes and the Upper Bound Conjecture, Cambridge University Press, ISBN 978-0-521-08017-0, MR 0301635
- Shephard, Geoffrey Colin (1972), Queens' College Dial: A Short Description of the Sun-dial in Queens' College, Cambridge, Self-published, ISBN 978-0-9503358-0-3