Mark attended Auburn University from 1981 to 1984 on a 4 year basketball scholarship. He played forward on the varsity basketball team and was a team mate to Charles Barkley. Mark was named to the Academic All-SEC team (first team) in 1983 and 1984. He was also an honorable mention to the Academic All-American team. He earned his bachelor's degree in Business.

After graduation Mark spent a few years in the business world, working at IBM and in various management positions. He later surrendered his heart to Jesus Christ and asked God to put him in a place where he could touch as many lives as possible. Within the year, he became a teacher at a Christian high school. Mark's plans were to teach for the rest of his life, but God had something different in mind. Mark felt called to devote a year to full-time evangelism before embarking on a speaking career. Mark founded Mark Cahill Ministries in 1998.

One Thing You Can't Do In Heaven, Ninth Printing, June 2007"Are You ready for eternity? If so are you helping others get ready for that journey into eternity that each of us must take? As believers, we all know we should tell others about the Lord, but we often don't know how. This practical book will give you ideas for starting conversations, examples of witnessing situations, and answers to common questions..."

One Heartbeat Away: Your Journey Into Eternity, Sixth Printing, 2007"You were born. You learned to walk and talk. You went to kindergarten and then elementary school. You learned to play sports. You went to junior high and high school...You got a job. You got married. You had some kids. You retired. You died. Now what? What happens after we take our last breath? Is there something out there after we die?..."