Here are his acting credits:

Actor:
In Production
2000s
1990s
1980s
1970s
1960s
Elmo's Christmas Countdown (2007) (TV) (filming) (voice) .... The Count
A Sesame Street Christmas Carol (2006) (V)
"Sesame Street" .... Herry Monster / ... (11 episodes, 1970-2006)... aka Open Sesame (New Zealand: English title: new syndication title) ... aka Sesame Street Unpaved (USA: syndication title) ... aka The New Sesame Street (USA: new syndication title) - 4109 (2006) TV Episode .... Count - Episode #33.50 (2002) TV Episode (voice) .... Count von Count - Miles Babysits (2000) TV Episode (voice) .... The Announcer/Fat Blue/Herbert Birdsfoot/Sherlock Hemlock/Herry Monster/Farley/Amazing Mumford/Frazzle/Simon Soundman/Snuffy Snuffleupagus/Brother Twiddlebug/Sam the Robot/The Count/Biff/Rodeo Rosie/Genie/Two-Headed Monster/Fred the Wonderhorse/Jarome/Leonard Wolf/Additional Muppets - Episode #17.1 (1985) TV Episode (voice) .... Count von Count/Two-Headed Monster - Episode #15.4 (1983) TV Episode (voice) .... Herry Monster/Frazzle (6 more)
Guess That Shape and Color (2006) (V)
Elmo Visits the Doctor (2005) (V) .... The Count
Sesame Street: All-Star Alphabet (2005) (V)
Sesame Street: Friends to the Rescue (2005) (V)
Sesame Street Presents: The Street We Live On (2004) (TV) (voice) (also archive footage) .... The Count/Herry Monster/Fat Blue... aka Sesame Street: Elmo's World - The Street We Live On! (USA: DVD box title)
Muppets Party Cruise (2003) (VG) (voice) .... Statler/Camilla the Chicken/Crazy Harry/Dr. Julius T. Strangepork/Floyd Pepper/Lew Zealand
It's a Very Merry Muppet Christmas Movie (2002) (TV) .... Robin the Frog/Statler/Announcer/Pops/Floyd Pepper/Kid #1
Kermit's Swamp Years (2002) (V) (voice) .... Statler
Muppet Monster Adventure (2000) (VG) (voice) (also archive footage) .... Robin the Frog/Herry Monster/Frazzle/Pa Gorg
Muppet Race Mania (2000) (VG) (voice) (also archive footage) .... Floyd/Robin/Statler
The Adventures of Elmo in Grouchland (1999) (voice) .... Count/Pestie/Grouch Mayor/Grouch Cop
Muppets from Space (1999) (voice) .... Robin/Statler/Ubergonzo/Floyd
Cinderelmo (1999) (TV) (voice) .... Count von Count
"Muppets Tonight" .... One of the Elvises / ... (1 episode, 1996-1998)... aka Muppets, Les (France) - Episode #1.1 (1996) TV Episode (voice) .... Statler/The Bird Announcer/One of the Elvises
Muppet Treasure Island (1996) (voice) .... Blind Pew/Mad Monty/Statler/Corn/Floyd (uncredited)/Lew Zealand (uncredited)/Pirate (uncredited)/Robin the Frog (uncredited)/Skulls (uncredited)/Butler/Screaming Cat (uncredited)
The Muppet CDROM: Muppets Inside (1996) (VG) .... Lew Zealand, Statler
Elmo Saves Christmas (1996) (V) (voice) .... Count von Count
Muppets Treasure Island (1996) (VG) (voice)
Sesame Street Jam: A Musical Celebration (1994) (TV) (voice) .... The Count/The Amazing Mumford/Herrie Monster
"The Secret Life of Toys" (1994) TV Series .... Balthazar... aka Jim Henson's Secret Life of Toys
Muppet Classic Theater (1994) (V) .... Robin the Frog, Big Bad Wolf, Royal Advisor. The Wolf, Montague the Rat
It's Not Easy Being Green (1994) (V) .... Robin the frog/Emmet Otter
The Muppet Christmas Carol (1992) (voice) .... Tiny Tim Crachit/Jacob Marley/Ma Bear/Ghost of Christmas Present/Floyd Lew Zealand/Mouse (uncredited)/Mr. Applegate (uncredited)/Penguin (uncredited)/Pig Gentleman (uncredited)/Pops (uncredited)/Rat (uncredited)
Muppet Mayhem (1992) (V) (voice) .... Various Muppets
Muppet Breaking Point (1992) (V) (voice) .... Announcer
Muppet*vision 3-D (1991) (voice) .... Camilla... aka Jim Henson's Muppet*vision 3-D ... aka Kermit the Frog presents Muppet*vision 3-D ... aka Muppet*vision 4-D
RoboCop 2 (1990) .... Darren Thomas
The Muppets at Walt Disney World (1990) (TV) (voice) .... Camilla/Ma Bear/Floyd/Robin the Frog
Sesame Songs: Monster Hits! (1990) (V) (voice) .... Herry Monster/Announcer/Frazzle/Two-Headed Monster... aka Monster Hits! (USA: short title)
Sesame Songs: Rock & Roll (1990) (V) (voice) (also archive footage) .... Jackman Wolf/Little Jerry/The Count/Farely/Others
The Radicals (1990) .... George Blaurock
"The Jim Henson Hour" (1989) TV Series .... Jobeth Garf Toohoo, Bubba the Bartender (unknown episodes)
Sesame Street, Special (1988) (TV) (voice) .... Pretty Great Performances Announcer/Mr. Johnson/Count Von Count/Additional Muppets... aka Put Down the Duckie: A Sesame Street Special (USA: video title) ... aka Sesame Street: Put Down the Duckie - An All-Star Musical Special (USA: video box title) ... aka The Sesame Street Special (USA: informal title)
Count It Higher: Great Music Videos from Sesame Street (1988) (V) (also archive footage) .... Count Von Count/Biff/"Over the Top" Lead Singer/Alphabeat
Winners Take All (1987) .... Head Official
A Muppet Family Christmas (1987) (TV) (voice) .... Emily 'Ma' Bear/Robin the Frog/Sgt. Floyd Pepper/Count von Count/Herry Monster/Two-Headed Monster - Frank/Gobo Fraggle/Biff/Camilla the Chicken/Crazy Harry/Lew Zealand/Lewis Kazagger/Pops/Sherlock Hemlock/Fred the Wonder Horse/Simon Soundman
The Christmas Toy (1986) (TV) (voice) .... Balthazar... aka Jim Henson's The Christmas Toy
The Muppets: A Celebration of 30 Years (1986) (TV) .... Camilla, Count von Count, Crazy Harry, Dr. Julius Strangepork, Pops, Lew Zealand, Robin the Frog, Louis Kazagger, Sgt. Floyd Pepper, J.P. Gross, Harry Monster, Two-Headed Monster (Frank), Biff, Sherlock Hemlock, The Amazing Mumford
Learning About Numbers (1986) (V) (voice) .... Count
Sesame Street Presents: Follow that Bird (1985) (voice) .... Biff/Count/Herry/Sherlock Hemlock (principal Muppet performers)... aka Follow That Bird
Muppet Video: The Kermit and Piggy Story (1985) (V)
Muppet Video: Gonzo Presents Muppet Weird Stuff (1985) (V) (also archive footage) .... All of Me Singing Monster/Additional Characters
The Muppets Take Manhattan (1984) (voice) .... Camilla/Lew Zealand/Floyd/Bear/Chicken/Crazy Harry/Dog/Dr. Strangepork/Granny/Penguin/Pops/The Count
"Fraggle Rock" .... Architect / ... (31 episodes, 1983-1987)... aka Fraggle Rock with Jim Henson's Muppets (complete title) ... aka Jim Henson's Fraggle Rock (USA: complete title) - Sir Hubris and the Gorgs (1984) TV Episode (voice) .... Gobo Fraggle/Marjorie the Trash Heap/Pa Gorg/Architect/Additional Muppets - The Wizard of Fraggle Rock (1983) TV Episode (voice) .... Gobo Fraggle/Marjorie the Trash Heap/Pa Gorg/Architect/Additional Muppets - Boober Rock (1983) TV Episode (voice) .... Gobo Fraggle/Marjorie the Trash Heap/Pa Gorg/Architect/Additional Muppets - Wembley's Egg (1983) TV Episode (voice) .... Gobo Fraggle/Marjorie the Trash Heap/Pa Gorg/Architect/Additional Muppets - New Trash Heap in Town (1983) TV Episode (voice) .... Gobo Fraggle/Marjorie the Trash Heap/Pa Gorg/Architect/Additional Muppets (26 more)
Don't Eat the Pictures: Sesame Street at the Metropolitan Museum of Art (1983) (TV) (voice) .... The Count
Big Bird in China (1983) (TV) (voice) .... Two-Headed Monster
The Dark Crystal (1982) (voice) .... High Priest/Dying Emperor
The Great Muppet Caper (1981) (voice) .... Floyd/Pops/Lew Zealand/Crazy Harry/Lewis Kazager (uncredited)/Slim Wilson (uncredited)/Zeke (uncredited)/CB Voice (uncredited)/Man in Park (uncredited)
The Muppets Go to the Movies (1981) (TV) (voice) .... Lew Zealand, Pops, Dr. Julius Strangepork, Sgt. Floyd Pepper
"The Muppet Show" .... Sgt. Floyd Pepper / ... (20 episodes, 1976-1981) - Episode #5.12 (1980) TV Episode (voice) .... Sgt. Floyd Pepper/Crazy Harry/Dr. Julius Strangepork/Pops/Announcer - Episode #5.24 (1980) TV Episode .... Various - Mark Hamill/Star Wars (1980) TV Episode .... Various - Episode #3.20 (1979) TV Episode .... Various - Episode #2.16 (1977) TV Episode (voice) .... Floyd Pepper/Baskerville/Robin/Dr. Strangepork/The Announcer (15 more)
John Denver and the Muppets: A Christmas Together (1979) (TV) .... Camilla/Crazy Harry/Lew Zealand/Robin the Frog/Sgt. Floyd Pepper
The Muppet Movie (1979) (voice) .... Floyd Pepper/Robin the Frog/Crazy Harry/Lew Zealand/Camilla/Dr. Bunsen Honeydew (assistant) (uncredited)
The Muppets Go Hollywood (1979) (TV) (voice) .... Floyd Pepper/Mutation Monster
Christmas Eve on Sesame Street (1978) (TV) (voice) .... Snuffy/The Count
Julie Andrews: One Step Into Spring (1978) (TV) (voice) .... Floyd Pepper
The Bob Hope All Star Christmas Comedy Special (1977) (TV) (voice) .... Robin... aka Texaco Presents The Bob Hope All Star Christmas Comedy Special (USA: complete title)
Emmet Otter's Jug-Band Christmas (1977) (TV) (voice) .... Emmet Otter/Weasel
"Saturday Night Live" .... Scred (16 episodes, 1975-1976)... aka NBC's Saturday Night (USA: first season title) ... aka SNL (USA: informal title) ... aka SNL 25 (USA: alternative title) ... aka Saturday Night (USA: second season title) ... aka Saturday Night Live '80 (USA: sixth season title) - Lily Tomlin/James Taylor (1976) TV Episode (voice) (as Jim Henson's Muppets) .... Scred - Raquel Welch/Phoebe Snow, John Sebastian (1976) TV Episode (voice) (as Jim Henson's Muppets) .... Scred - Ron Nessen/Patti Smith Group (1976) TV Episode (voice) (as Jim Henson's Muppets) .... Scred - Anthony Perkins/Betty Carter (1976) TV Episode (voice) (as Jim Henson's Muppets) .... Scred - Dick Cavett/Jimmy Cliff (1976) TV Episode (voice) (as Jim Henson's Muppets) .... Scred (11 more)
Julie Andrews: One to One (1975) (TV) (voice) .... T.R./Catgut/The King of Phumph
Muppets No-Nonsense Show (1975) (TV) (voice)
The Muppet Show: Sex and Violence (1975) (TV) (voice) .... Sgt. Floyd Pepper/Thomas Jefferson/Dancers/Announcer/Statler/Whaddayasay Bird/Melg/Envy/Pencil/Gluttony/Gene Shalit/Dr. Nauga/Sloth
Muppet Picker Upper (1975) (voice) .... P. Fenton Cosgrove
Out to Lunch (1974) (TV) (voice)
The Muppets Valentine Show (1974) (TV) (voice) .... Droop/Frog/Miss Mousey/Thog/Female Koozbanian
Tales from Muppetland: The Muppet Musicians of Bremen (1972) (TV) (voice) .... T.R. the Rooster/Caleb Siles... aka Muppet Musicians of Bremen (USA: video box title)
Pure Goldie (1971) (TV) (voice) .... Snivelly
Tales from Muppetland: The Frog Prince (1971) (TV) (voice) .... Robin/Featherstone... aka The Frog Prince (USA: short title)
The Great Santa Claus Switch (1970) (TV) (voice) .... Thog/Zippity/Snivelly
Hey Cinderella! (1969) (TV) (voice) .... Featherstone/Stepsister #2
The Cube (1969) (TV) .... Monk

- Uke Man