Everett Claire Olson was an American zoologist, paleontologist, and geologist noted for his seminal research of origin and evolution of vertebrate animals. Olson identified a mass extinction that occurred 270 million years ago and which now carries his name - Olson's Extinction, also termed "Olson's Gap". Some of his other notable research also included genus of Slaugenhopia genus of Trimerorhachis, and genus of Waggoneria.
