Mack Stiles is CEO of Gulf Digital Solutions and General Secretary for the Fellowship of Christian UAE Students (FOCUS) in the United Arab Emirates. He has worked for many years with InterVarsity Christian Fellowship in the United States. He is the author of Marks of the Messenger and Speaking of Jesus. Mack loves thinking through how to apply the gospel of grace to issues confronting students in the university world. He is married to Leeann, and they have three sons.