Marc was born on May 25, 1964, in Newcomerstown, Ohio to Earl and Billie Gibson, one of five children (brothers David, John, Dan, and sister Jane Vierheller). He graduated high school in Newcomerstown (1982), and then attended Florida College (Temple Terrace, FL) where he earned an AA degree (1984), a three-year advanced Bible degree (1987), and a BA degree in Biblical Studies (1999). He also earned a BA degree in history at the University of South Florida (1989).

Marc married Kellie Hammer on June 18, 1988, in Temple Terrace, FL and they have four children: Katie (b. 1992), Kristie (1994), Kimmie (1997), and William (Marc, Jr. 1999). He has preached at Frostproof, FL (1990-1996), Lakeland Hills Blvd in Lakeland, FL (1996-2011), Central in Tampa, FL (2011-2020), and presently at the Seffner church of Christ, Seffner, FL (2020-). Marc and Kellie presently live in Lakeland, FL.