Matthew Carroll is a person. As a person, he spends his time art directing and writing advertising, being a dad and doing dad things, being a husband and doing husband things, eating food and sleeping and some other activities that are private. His main contribution to the literary arts is the book of things his daughter said to him when she was a toddler, "Can I Sit On Your Lap While You're Pooping?" It is available in bookstores nationwide and on the Internet globally except wherever they don't have Internet, which is actually a lot of places.