Jeffrey Duncan Jones ( born September 28 , 1946 ) is an American actor best known for his roles as Emperor Joseph II in `` Amadeus '' , Edward R. Rooney in `` Ferris Bueller 's Day Off '' , and Charles Deetz in `` Beetlejuice '' .
Jeffrey Duncan Jones ( born September 28 , 1946 ) is an American movie , television , voice , and stage actor who is best known for his roles as Emperor Joseph II in Miloš Forman 's `` Amadeus '' , Charles Deetz in `` Beetlejuice '' , and Dean of Students Edward R. Rooney in the 1986 John Hughes movie `` Ferris Bueller 's Day Off '' .