Danny DeVito works.
Daniel Michael DeVito , Jr. ( born November 17 , 1944 ) is an American actor , comedian , director and producer . He gained prominence for his portrayal of the taxi dispatcher Louie De Palma in the television series Taxi ( 1978 -- 1983 ) , which won him a Golden Globe and an Emmy . He currently stars as Frank Reynolds on the FX and FXX sitcom It 's Always Sunny in Philadelphia . He directs , produces and appears in graphic , short , horror films for his Internet venture The Blood Factory .