Doug Simpson is an American actor known for a variety of television roles, including Coroner Spring in Aquarius (2015-2016), Principal Mathews in Black-ish (2015), Dr. Barton in Mad Men (2015), and Richard Castle's attorney Henry, in Castle (2014).Trained at Illinois State, Steppenwolf Theater, Upright Citizens Brigade - NY and Lesly Kahn & Company, Simpson spent many years both performing and producing theater in Chicago and New York.He now lives with his wife and son in Los Angeles.