Harold Williams was a pastor for six years before accepting the position of Dean of Florida Baptist Institute and Seminary, and concurrently was Instructor of Missions for fifteen years. He has assisted churches across the USA and overseas in over 300 Mission Conferences, teaching the basic Biblical principles of Faith Promise. A missionary-at-large, he ministers around the world, as opportunity is presented. He consults with missionaries and conducts training seminars, Bible conferences, and missions conferences, generally sharing encouragement and insight with missionaries and pastors around the world. He continues to oversee the Macedonian Missionary Service and administers the Macedonian Call radio broadcast, which is aired over Trans World Radio in different parts of the world.