Mark Duncan began to preach the word at the age of 23, just before being elected as an elder the Seventh-day Adventist church. He has served as an elder for over 24 years and enjoys sharing the good news of the gospel more than his current vocation, electrical engineering. Mark also enjoys writing and has coauthored one book and has several published articles to his credit. He is a member of the Gospel Study Group, a small Bible study group that meets biannually at Andrews University Theological Seminary. He currently resides in Arkansas. He and his wife Jennifer have four young adult daughters.