Leonard Joseph "Len" Cariou Plays the part of Henry "Grandpa" Reagan on CBS TVs "Blue Bloods" (born September 30, 1939) is a Canadian actor, best known for his portrayal of Sweeney Todd in the original cast of Sweeney Todd, the Demon Barber of Fleet Street. He currently plays the patriarch, Henry Reagan, NYPD Police Commissioner (retired), in the multi-generational television series Blue Bloods on CBS.