Mark Oestreicher has been involved in church ministry his whole life, particularly with teenagers and youth workers. Mark has had a broad experience working in churches in roles ranging from Junior High Pastor to Executive Pastor. For 11 years, Marko was at Youth Specialties in San Diego, an organization that trains and equips church youth workers—the last 8 of those years as president. Mark has authored or contributed to more than 70 books, including the much-talked-about Youth Ministry 3.0. Marko is a partner in The Youth Cartel, providing resources, training and coaching for church youth workers. Mark has been married to Jeannie for 34 years, and has two children.