John Howard Yoder is one of the best-known Mennonite thinkers on peace. But before Yoder there was Guy F. Hershberger, whose reflections on war, violence and peace helped Mennonites navigate perilous times in early to mid-20th century, and who also laid the foundation for what became the Alternative Service Program in the U.S. during World War II. In the 1960s, he played an important role in guiding the Mennonite church's response to the civil rights movement, nudging them toward greater openness to Martin Luther King's call for justice for African-Americans. In this definitive biography, Theron F. Schlabach shows how Hershberger helped Christians live their faith in a world beset by war and injustice, at the same time pioneering creative ways to engage pressing concerns such as civil rights, economic justice and capital punishment.