Peter McWilliams (August 5, 1949 – June 14, 2000) was an American bestselling author known for his self-help and personal growth books. His notable works include "You Can't Afford the Luxury of a Negative Thought" and "Life 101," which gained widespread popularity in North America. McWilliams was also a prominent advocate for medical marijuana legalization. He passed away in Los Angeles at age 50.
