Marcus Lyle "Mark" Prophet was a controversial American New Age religious figure, self-proclaimed prophet, orator, and husband of Elizabeth Prophet. He claimed to be a Messenger of the Ascended Masters and founded The Summit Lighthouse organization on August 7, 1958 in Washington D.C.

Elizabeth Clare Prophet was an American spiritual leader, author, orator, and writer. In 1963 she married Mark L. Prophet, who had founded The Summit Lighthouse in 1958. Mark and Elizabeth had four children. Elizabeth, after her second husband's death on February 26, 1973, assumed control of The Summit Lighthouse.