Mark Hart serves full time as executive vice president of Life Teen International. A graduate of the University of Notre Dame, Mark is a best-selling Catholic author and popular speaker. His weekly video podcast is seen in more than twenty countries and his DVD study series, "Encounter," "T3," and "Altaration" are currently utilized by middle school and high school youth groups and in parochial classrooms across the country and beyond. Mark and his wife, Melanie, have three daughters (Hope, Trinity and Faith) and one son, Josiah. They live in Phoenix, Arizona.