Dr. Owen Gingerich
September 27, 2014: AstroAssembly
A Retrospective of the Science of Astronomy in 1914
December 3, 2004: Monthly Meeting
The Book Nobody Read: Chasing the Revolutions of Nicolas Copernicus
September 29, 1989: AstroAssembly
The Great Copernicus Chase
April 8, 1988: Monthly Meeting