Arnold grew up in Eastern Ontario and after attending Ottawa Teacher’s College and teaching Public School for two years, he studied at Waterloo College, University of Western Ontario and Knox College, Toronto. He later graduated with a Doctor of Ministry from McCormick Theological Seminary, Chicago and obtained Certificates in Supervised Pastoral Education, Basic Interim Ministry Training and Leadership Training for Stephen Ministry
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Arnold served as a Pastor at St. James Presbyterian Church in Melfort, Saskatchewan. He was Chaplain at Brookside School in Cobourg, and Maplehurst Correctional Complex in Milton, Ontario, until 1980. He was Regional Coordinator of Religious and Spiritual Services, Toronto Region for the Province of Ontario in the Ministries of Health, Corrections and Community and Social Services until 1994. He then served as Interim Minister of Knox, Acton; Burns, Erin and Knox, Ospringe; St. Andrew’s, Brampton and Interim Associate at Knox, Guelph.
At Knox, Arnold implemented Stephen Ministry in 2002 and currently serves as the Stephen Leader.