David Rodman Annable (born September 15, 1979) is an American actor. His best known roles include Justin Walker on the ABC television drama …David Rodman Annable (born September 15, 1979) is an American actor. His best known roles include Justin Walker on the ABC television drama Brothers & Sisters (2006–11), Henry Martin on the ABC supernatural drama 666 Park Avenue (2012–13), Dr. Adam McAndrew on the Fox medical drama Red Band Society (2014–15) and Pierce Harrison on the NBC medical drama Heartbeat (2016).