John Franklin Lofland (born March 4, 1936) is an American sociologist best known for his studies of the peace movement and for his first book, Doomsday Cult: A Study of Conversion, Proselytization, and Maintenance of Faith, which was based on field work among a group of Unification Church members in California in the 1960s. It is considered to be one of the most important and widely cited studies of the process of religious conversion, and one of the first modern sociological studies of a new religious movement. Source: Wikipedia (en)