RAVI ZACHARIAS is the founder and president of Ravi Zacharias International Ministries, headquartered in Atlanta, Georgia, with additional offices in Canada, Hong Kong, India, Singapore, the United Kingdom, Austria, South Africa, Spain, and Turkey. Dr. Zacharias and his wife, Margie, have three grown children. He is the author of many books, including Can Man Live Without God and Why Jesus? DR. VINCE VITALE, born in NYC and raised in a family one generation removed from Mafia heritage, went to study philosophy at Princeton University and then took an unexpected journey that led him to God. In his PhD, Vince went on to develop a new response to the problem of evil. He now teaches at Wycliffe Hall of Oxford University, is Senior Tutor at the Oxford Centre for Christian Apologetics, and is a speaker for RZIM.