Wenger had been invited to teach at Goshen college by President Sanford Calvin Yoder in 1936, and in early September 1938, he began a teaching career there. Also in 1938, he took the Westminster Examinations (which he had failed to do before leaving for Europe) and did badly. Wenger joined the editorial board of the Mennonite Weekly Review in March 1939. He took summer courses at University of Michigan at Ann Arbor in 1939, 1940, and 1942, earning him an M.A. in Philosophy.
