In 1975 Prophet founded Church Universal and Triumphant, which became the umbrella organization for the movement, and which she expanded worldwide. She also founded Summit University and Summit University Press. In the late 1980s Prophet controversially called on her members to prepare for the possibility of nuclear war at the turn of the decade, encouraging them to construct fallout shelters. In 1996, Prophet handed day-to-day operational control of her organization to a president and board of directors. She maintained her role as spiritual leader until her retirement due to health reasons in 1999.