He was the American Professor Emeritus of Church History and Mission at the Anabaptist Mennonite Biblical Seminary in Elkhart, Indiana.
In 1995 he was accorded the status of Master of Arts in the University of Oxford and his name was added to the Register of Congregation.
Kreider served as an adjunct faculty member of Anabaptist Mennonite Biblical Seminary beginning in 1997.
As a public speaker, Kreider has taken part in a debate on the arms race with Marshal of the Royal Air Force The Lord Cameron of Balhousie as part of the London Lectures on Contemporary Christianity at All Souls Church, Langham Place (1982) and with Lord Trefgarne, Edward Leigh MP, and Canon Paul Oestreicher, at the Cambridge Union Society (1983).
He has been Senior Mission Scholar in Residence at the Overseas Ministries Study Center, New Haven, Connecticut (2005).