Marpeck:

Walter Klaassen is an adjunct professor at the College of Emmanuel and St. Chad and an adjunct professor of history at the University of Saskatchewan. He holds graduate degrees from McMaster University, McMaster Divinity College, and Oxford University. Klaassen has taught Bible and church history at Bethel College, Conrad Grebel University College, and Okanagan University College. He is editor of the widely used source book, Anabaptism in Outline.

William Klassen is adjunct professor and Principal Emeritus at St. Paul's College, University of Waterloo, Ontario. He has been professor of New Testament and Peace Studies at Associated Mennonite Biblical Seminary, the University of Manitoba, Simon Fraser University, the University of Toronto, and the Ecole Biblique, Jerusalem.