 Martin taught psychology, psychopharmacology, and the Biblical basis of behavior for five years at Geneva College, where he was a member of the department of psychology.In his 1994 book "Cult-Proofing Your Kids", Martin wrote about his former membership and leadership in the Great Commission International (currently called Great Commission Association of Churches).In 1971, he dropped out of graduate school to join the group, when it was known as "The Blitz".