Susan Powter is an Australian born American motivational speaker, nutritionist, personal trainer, and author, three-time New York Times bestselling author, AOL's third largest seller in TV history, and the woman dubbed " the Lenny Bruce of Wellness" by Shape magazine, who rose to fame in the 1990s with her catchphrase " Stop the Insanity! " , which was the centerpiece of her weight loss infomercial. She hosted her own talk show The Susan Powter Show in the 1990s.