Arthur Penhallow (born December 20, 1943) is a radio presenter in Detroit, Michigan who hosted afternoons on active rock station WRIF from 1970-2009. On March 30, 2009, WRIF owner Greater Media announced that the station and Penhallow had been unable to come to terms on a new contract. Penhallow regularly refers to himself as "Big Daddy Arthur P" or simply, "Big Daddy", as do others on the station. Fans typically refer to him simply as "Arthur P". Penhallow played himself in the film The Upside of Anger. Arthur Penhallow is moving back to Michigan the week of May 1, 2017.