This biographical history follows the iconoclastic career of John R. Friedeberg Seeley, pre-eminent “Pop Sociologist” and Mental Health Activist of the 1950s. Seeley’s “strange journey” began as a British Home Child, estranged from his cosmopolitan German-Jewish family. Seeley progressed through the ranks of the Canadian Army Medical Corps, and the University of Chicago, to achieve prominence as the author of Crestwood Heights, a defining work of postwar social science. He led an ambitious mental health project in Canadian schools, and was a founding father of York University. However, Seeley’s struggle with mental illness and Jewish identity brought him into conflict with the Canadian establishment. His career ended in academic exile, but his dream of a mental health revolution still resonates.