As a young man, Applewhite attended several universities and served in the United States Army. He initially pursued a career in education until he resigned from the University of St. Thomas in Houston, Texas, in 1970, citing emotional turmoil. His father's death a year later brought on severe depression. In 1972, Applewhite developed a close friendship with Bonnie Nettles, a nurse; together, they discussed mysticism at length and concluded that they were called as divine messengers. They operated a bookstore and teaching center for a short while and then began to travel around the U.S. in 1973 to spread their views. They only gained one convert. In 1975, Applewhite was arrested for failing to return a rental car and was jailed for six months. In jail, he further developed his theology.