Mark Cahill has a business degree from Auburn University, where he was an honorable mention Academic All-American in basketball. After spending a few years in the business world, he surrendered his heart to Jesus Christ and asked God to place him where he could touch as many lives as possible. Within a year, he was teaching school. Although Mark planned to teach for the rest of his life, God moved him from teaching at a Christian high school to devoting a year to full-time evangelism. He then embarked on a speaking career. Mark speaks to over 25,000 people per year at churches, retreats, conferences, camps, etc., equipping and challenging the saved to go out and reach the lost. As one of his students noted, he's still teaching, but in a much bigger classroom.

His true vocation is witnessing, whether at malls, music and art festivals, beaches, sporting events, bar sections of towns—wherever the lost can be found. Mark is the author of One Thing You Can’t Do in Heaven which has been translated into Russian, Chinese, Spanish, Romanian and is being translated into Nepalese, and One Heartbeat Away. Mark lives in Stone Mountain, Georgia