March 2000, American Institute of Biological Sciences, Museum of Natural History, Smithsonian Institution, Washington DC, USA
Transcript is embedded into YouTube video above
Stephen Jay Gould: On Evolution - 1995
1995, web education program released by The Voyager Company
Gould's most significant contribution to evolutionary biology was the theory of punctuated equilibrium, which he developed with Niles Eldredge in 1972. The theory proposes that most evolution is characterized by long periods of evolutionary stability, which is infrequently punctuated by swift periods of branching evolution.