John Mark Hall (born September 14, 1969) is the lead vocalist for the Georgia-based contemporary Christian music group Casting Crowns, a seven-member group composed of worship leaders. Hall is also youth pastor at Eagle's Landing First Baptist Church in McDonough.Hall was diagnosed with learning disabilities as a child, including attention deficit disorder just before third grade. He also was diagnosed with dyslexia. Mark defines himself as "a broken person made whole". He talks about his trials in his book Lifestories.