 Feinberg taught from 1966 to 1970 at Moody Bible Institute, then from 1970 to 1972 at Trinity College.From 1972 through 1974, he served as a field representative for the American Board of Missions to the Jews, and then joined the faculty of Trinity Evangelical Divinity School, where he taught the rest of his life.Feinberg was also an ordained minister in the Evangelical Free Church of America, and in 1977 he helped found the Village Church (EFCA) of Lincolnshire, Illinois.