Daniel Jay Millman is an American author and lecturer in the personal development field. He is best known for the movie Peaceful Warrior, based on his own life and taken from one of his books.

Born on February 22, 1946, in Los Angeles, California, Millman is an ex-world champion athlete, martial arts instructor, coach, college professor, and occasional actor. After 20 years of intensive spiritual exploration, his teachings took shape in Way of the Peaceful Warrior and are fully expressed in his books and classes. His work continues to evolve to meet the needs of a changing world.

Millman has written 14 books, including Way of the Peaceful Warrior, which have inspired millions of readers in more than 30 languages worldwide. The film adaptation, Peaceful Warrior, starring Nick Nolte, is based on real events in his life. He spends much of his time writing books and giving talks and lectures, reaching across generations to connect with people from all walks of life, including leaders in health, psychology, education, business, politics, sports, entertainment, and the arts. He and his wife, Joy, live in Northern California and are parents to three daughters.