Mark L. Prophet was an American spiritual teacher and author, best known for co-founding the Summit Lighthouse in 1958. He played a significant role in the New Age movement, promoting teachings that emphasized personal spiritual growth and the importance of divine guidance. Prophet was also known for his writings on ascended masters and the concept of spiritual alchemy. His teachings often focused on the power of the spoken word and the use of affirmations to manifest positive change in one's life. His work continues to influence many in the realm of spiritual development.