Earl Nightingale
Earl Nightingale (1921–1989) was a pioneering motivational speaker and author known as the “Dean of Personal Development.” Rising from a difficult childhood, he served in the U.S. Marine Corps during World War II and later built a successful career in radio. He became famous for his 1956 recording The Strangest Secret, which popularized the idea that “we become what we think about.” He also co-founded Nightingale-Conant, helping spread self-improvement teachings worldwide.