NORTH NEWTON, Kan. — Robert S. Kreider, an educator and historian who championed causes of peace, service and cooperation through Anabaptist engagement with the world, died Dec. 27. He was 96. Driven by limitless curiosity and optimism, Kreider’s life spanned Civilian Public Service leadership as a conscientious objector during World War II, postwar relief leadership for Mennonite Central Committee in Europe, the presidency of Bluffton (Ohio) College and diverse historical interests that included a successful inter-Mennonite effort to acquire 300-year-old Martyrs Mirror printing plates.