Mark is a 36-year veteran of youth ministry and is the author or co-author of 10 books, including Family-Based Youth Ministry and Sustainable Youth Ministry. Mark has been a guest lecturer or adjunct professor at a number of colleges and seminaries including Princeton Theological Seminary, Duke Divinity School, Yale Divinity School and Vanderbilt Divinity School. He speaks widely around the United States as well as having taught in Canada, Ireland, Northern Ireland, Singapore, South Africa, Rwanda, Uganda, and Ecuador. Mark is the founder or co-founder of a number of ministry enterprises, including Ministry Architects, the Center for Youth Ministry Training, Justice Industries, and Ministry Incubators. Mark and his wife Susan have three grown children and three grandchildren and live in Nashville, Tennessee.(Bio dated 2016)