Mark Hart, affectionately known to millions across the world simply as the “Bible Geek,” serves as executive vice president for Life Teen International. An award-winning author and producer, Mark is one of the most sought-after speakers in the Catholic Church today. He is a popular radio guest and has a weekly show, Fired Up with Mark Hart, on Sirius/XM Satellite Radio. He has written more than ten books, including Tweet Inspiration: Faith in 140 Character (or Less).