Dennis DeYoungActing • 1947-02-18No biography available.Known ForKilroy Was Here1983Fan ClubNo Nerds have favorited Dennis DeYoung yet — be the first.All fan clubsFrom NerdspinFilmographyActor7Writing12018Freaks and Geeks: The DocumentaryFilmSelf★ 6.82014Dennis DeYoung and the Music of Styx - Live in Los AngelesFilmHimself (Vocals / Keyboards)★ 8.02006100 Greatest Songs of the '80sTVSelf • 5 episodes2003Canadian IdolTVSelf • 2 episodes★ 6.01997Styx - Return to ParadiseFilmHimself (Vocals / Keyboard)★ 5.51984Styx - Caught In The ActFilmHimself (Vocals / Keyboard)★ 7.21983Kilroy Was HereFilmRobert Orin Charles Kilroy (R.O.C.K.)