Mark Feuerstein (born June 8, 1971) is an American actor, producer, and writer best known for his starring role as Dr. Hank Lawson on the long-running USA Network series Royal Pains (2009–2016). A Princeton University graduate and Fulbright scholar who studied in London, Feuerstein has built a prolific career in television and film, including roles in What Women Want, In Her Shoes, and Defiance. He has starred in multiple sitcoms, including Good Morning, Miami and 9JKL—the latter of which he co-created with his wife, Dana Klein—and recently appeared in Netflix’s The Baby-Sitters Club.