Dr. Roger Barrier retired as senior teaching pastor from Casas Church in Tucson, Arizona. In addition to being an author and sought-after conference speaker, Roger has mentored or taught thousands of pastors, missionaries, and Christian leaders worldwide. Casas Church, where Roger served throughout his 35-year career, is a megachurch known for a well-integrated, multi-generational ministry. The value of including new generations is deeply ingrained throughout Casas to help the church move strongly right through the twenty-first century and beyond. Dr. Barrier holds degrees from Baylor University, Southwestern Baptist Theological Seminary, and Golden Gate Seminary in Greek, religion, theology, and pastoral care. His popular book, Listening to the Voice of God, published by Bethany House, is in its second printing and is available in Thai and Portuguese. His latest work is, Got Guts? Get Godly! Pray the Prayer God Guarantees to Answer, from Xulon Press. Roger can be found blogging at Preach It, Teach It, the pastoral teaching site founded with his wife, Dr. Julie Barrier.