Mathematics and Sculpture:

George Hart
Brent Collins
Helaman Ferguson
Bathsheba Grossman
Jean-Pierre Hébert
Chris Palmer
Charles O. Perry
John Robinson
Carlo Sequin (Knots and tangles)
Arthur Silverman
Ken Snelson (tensegrity and rigidity)
Simon Thomas (Mathematics and Art Project)
Keizo Ushio
Koos Verhoeff images and text (fractal trees, etc.)
For more, see the International Society for Art, Math, and Architecture.
There is also general information for/about sculptors at Richard Collins' www.sculptor.org site.