Besides numerous scripts for the Adventures in Odyssey radio drama series, Marshal's work includes the book series Kidsboro, the musical drama Man of God, an Adventures in Odyssey video adaptation The Last Days of Eugene Meltsner, the radio drama Just South of Normal, due to air soon, and numerous other sketches and plays. Marshal attended Baylor University in Waco, Texas and graduate school at Regent University in Virginia Beach, Virginia. It was at Regent that he wrote a radio drama for a class he was enrolled in. The production was sent to Paul McCusker at Focus on the Family, who asked him to write more. His first full Adventures in Odyssey script was #214: “The Living Nativity”, and after four more were written over the course of the next year and a half, he was asked to come on staff in 1993. He worked at Focus until 1995, when he became a freelance writer. Marshal recently returned to Focus as a staff writer once again. Marshal moved to Nashville, Tennessee in June, 2010 with his wife, Stephanie, and three daughters, Bryn, Paityn and Kristyn.