Michael Green is an experienced evangelist on every continent. Currently, he is a Senior Research Fellow at Wycliffe Hall in Oxford, England, and a Canon of Coventry Cathedral. He travels worldwide on speaking and preaching engagements and is the bestselling author of over fifty books. He and his wife, Rosemary, have four gown children.

Alister E. McGrath is a historian, biochemist, and Christian theologian born in Belfast, Northern Ireland. McGrath, a longtime professor at Oxford University, now holds the Chair in theology, ministry, and education at the University of London. He is the author of several books on theology and history, including Christianity's Dangerous Idea; In the Beginning, and The Twilight of Atheism. He lives in Oxford, England and lectures regularly in the United States. SPANISH BIO: Alister McGrath es profesor de teologia historica en la Universidad de Oxford y director del Oxford Centre for Evangelism and Apologetics. Es autor de muchos libros altamente aclamados, incluyendo In The Beginning: The Story of the Kings James Bible.