BB
Filmography
| 2021 | The French Dispatch · as Uncle Nick |
| 2021 | The Chair (2021) (TV Series) · as Elliot Rentz |
| 2021 | The Harper House (TV Series) · as Buck Mastiff |
| 2020 | Space Force (TV Series) · as Ron (voice) |
| 2019 | The Politician (TV Series) · as Keaton Hobart |
| 2018 | Isle of Dogs · as King (voice) |
| 2018 | An L.A. Minute · as Shelly |
| 2018 | Condor (TV Series) · as Reuel Abbott |
| 2018 | Summer Camp Island (TV Series) · as Gerald |
| 2017 | Wormwood (2017) (TV Series) · as Dr. Harold A. Abramson |
| 2016 | Mascots · as Sol Lumpkin |
| 2016 | Mike Nichols: An American Master · as Unknown |
| 2016 | Eva Hesse · as Wilhelm Hesse (voice) |
| 2016 | I Am the Pretty Thing That Lives in the House · as Mr. Waxcap |
| 2016 | Starring Austin Pendleton · as Unknown |
| 2016 | Pitch (TV Series) · as Frank Reid |
| 2016 | Graves (TV Series) · as Secretary Burns |
| 2016 | Animals. (TV Series) · as Bob Balaban |
| 2015 | Hitchcock/Truffaut · as Narrator (voice) |
| 2015 | Everything Is Copy · as Unknown |
| 2015 | Show Me a Hero (TV Series) · as Leonard B. Sand |
| 2014 | The Grand Budapest Hotel · as Monsieur Martin |
| 2014 | The Monuments Men · as Pvt. Preston Savitz |
| 2014 | Broad City (TV Series) · as Arthur Wexler |
| 2013 | Muhammad Ali's Greatest Fight · as Lawyer |
| 2013 | Fading Gigolo · as Sol |
| 2013 | Family Tree (TV Series) · as Melvin Schmelff |
| 2013 | Alpha House (TV Series) · as Senator Elliot Robeson |
| 2012 | Girl Most Likely · as Maxwell |
| 2012 | Moonrise Kingdom · as The Narrator |
| 2012 | Girls (2012) (TV Series) · as Dr. Rice |
| 2011 | Thin Ice · as Leonard Dahl |
| 2011 | A Monster in Paris · as Pâté |
| 2011 | Web Therapy (TV Series) · as Ted Mitchell |
| 2010 | Howl · as Judge Clayton Horn |
| 2009 | Rage · as Mr. White |
| 2009 | The Good Wife (TV Series) · as Gordon Higgs |
| 2008 | Recount · as Ben Ginsberg |
| 2008 | Web Therapy (TV Series) · as Ted Mitchell |
| 2007 | License to Wed · as Jewellery Store Clerk |
| 2007 | No Reservations · as Therapist |
| 2007 | Dedication · as Arthur Planck |
| 2006 | For Your Consideration · as Philip Koontz |
| 2006 | Lady in the Water · as Harry Farber |
| 2005 | Capote · as William Shawn |
| 2005 | Trust the Man · as Tobey's Therapist |
| 2005 | Hopeless Pictures (TV Series) · as Unknown |
| 2004 | Marie and Bruce · as Roger |
| 2004 | Entourage (TV Series) · as Doctor |
| 2004 | Tom Goes to the Mayor (TV Series) · as Unknown |
| 2003 | A Mighty Wind · as Jonathan Steinbloom |
| 2002 | The Tuxedo · as Winton Chalmers (uncredited) |
| 2001 | The Majestic · as Elvin Glyde |
| 2001 | Plan B · as James Foster |
| 2001 | Ghost World · as Enid's Dad |
| 2001 | The Education of Max Bickford (TV Series) · as Dr. Lowell Sherman |
| 2001 | Gosford Park · as Morris Weissman |
| 2001 | The Mexican · as Bernie Nayman |
| 2000 | Best in Show · as Dr. Theodore W. Millbank, III |
| 1999 | Cradle Will Rock · as Harry Hopkins |
| 1999 | Natural Selection · as Dr. William Powell |
| 1999 | Now and Again (TV Series) · as Unknown |
| 1999 | The West Wing (TV Series) · as Ted Marcus |
| 1999 | Jakob the Liar · as Kowalsky |
| 1999 | Three to Tango · as Decker |
| 1997 | Deconstructing Harry · as Richard |
| 1997 | Clockwatchers · as Milton Lasky |
| 1996 | Conversation with the Beast · as Mr. Webster |
| 1996 | Waiting for Guffman · as Lloyd Miller |
| 1996 | The Late Shift · as Warren Littlefield |
| 1995 | Pie in the Sky · as Paul Entamen |
| 1995 | Legend (TV Series) · as Unknown |
| 1995 | Dr. Katz, Professional Therapist (TV Series) · as Bob Balaban |
| 1994 | City Slickers II: The Legend of Curly's Gold · as Jeffrey Sanborn (uncredited) |
| 1994 | Friends (TV Series) · as Frank Buffay Sr. |
| 1994 | Greedy · as Ed |
| 1993 | For Love or Money · as Ed Drinkwater |
| 1993 | Amos & Andrew · as Dr. R. A. (Roy) Fink |
| 1992 | Bob Roberts · as Michael Janes |
| 1992 | Unnatural Pursuits (TV Series) · as Lou Finkleberg |
| 1991 | Little Man Tate · as Quizmaster |
| 1990 | The Face of Fear · as Ira Preduski |
| 1990 | Alice · as Sid Moscowitz |
| 1989 | Dead Bang · as Elliott Webley |
| 1989 | The Simpsons (TV Series) · as Narrator (voice) |
| 1989 | Seinfeld (TV Series) · as Russell Dalrymple |
| 1987 | End of the Line · as Warren Gerber |
| 1985 | Amazing Stories (TV Series) · as Jo-Jo Gillespie |
| 1984 | 2010: The Year We Make Contact · as Dr. R. Chandra |
| 1984 | Nothing Lasts Forever · as Guy with sunglasses in espresso bar |
| 1984 | Miami Vice (TV Series) · as Unknown |
| 1981 | Absence of Malice · as Elliott Rosen |
| 1981 | Whose Life Is It Anyway? · as Carter Hill |
| 1981 | Prince of the City · as Santimassino |
| 1980 | Altered States · as Arthur Rosenberg |
| 1978 | Girlfriends · as Martin |
| 1977 | Close Encounters of the Third Kind · as David Laughlin |
| 1976 | America at the Movies · as Orr |
| 1975 | Report to the Commissioner · as Joey Egan |
| 1974 | The Bank Shot · as Victor Karp |
| 1972 | Maude (TV Series) · as Ambrose Riley |
| 1971 | Making It · as Wilkie |
| 1970 | Catch-22 · as Capt. Orr |
| 1970 | The Strawberry Statement · as Elliot |
| 1969 | Midnight Cowboy · as The Young Student |
| 1969 | Love, American Style (TV Series) · as Nick (segment "Love and the Fuzz") |
| 1968 | The Mod Squad (TV Series) · as Unknown |
| 1965 | Hank (TV Series) · as Unknown |