About J. Winfield Fretz J. Winfield Fretz was the founding President of Conrad Grebel University College. He also introduced the study of Mennonites into the University curriculum and taught many large classes on the Mennonites. Books by J. Winfield Fretz The Waterloo Mennonites A Community in Paradox by (author) J. Winfield Fretz The Waterloo Mennonites A Community in Paradox by (author) J. Winfield Fretz