Appeared as a mesmerist in the period drama "Affair of the Necklace"
Appeared as the department store owner Max Schreck in "Batman Returns"
Cast opposite Robin Williams in Barry Levinson's political comedy "Man of the Year"
Portrayed a reality TV producer in "Domino" opposite Keira Knightley as Domino Harvey, a model-turned-bounty hunter
Portrayed Marcus Porcius Cato in the TNT miniseries "Julius Caesar"
Portrayed real-life author Whitley Streiber, who claimed to have had encounters with aliens in "Communion"
Starred as the eldest of three brothers in a crime family in Ferrara's "The Funeral"
Worked for the summer as an assistant lion tamer with the Tarryl Jacobs Circus
Made Broadway debut in "J.B." (billed as Ronnie Walken)
Cast as the father with a criminal past in the downbeat but well-acted "At Close Range," co-starring Sean Penn and Chris Penn
Cast in the remake of ''The Stepford Wives,'' Bryan Forbes' 1975 cult classic about upper-crust women being replaced by robots with sunny dispositions
Cast opposite James Gandolfini, Susan Sarandon, and Kate Winslet in "Romance & Cigarettes," helmed by John Turturro
Co-starred in David Rabe's play about Hollywood "Hurlyburly"
Had first significant feature role in "The Anderson Tapes"
Occasionally replaced brother Glenn as Mike Bauer on CBS daytime drama "The Guiding Light"
Played an ex-con who gets embroiled in a robbery scheme in "The Opportunists"
Played Stanley Kowalski in "A Streetcar Named Desire" at the Williamstown Theatre Festival
Co-starred in Quentin Tarantino's "Pulp Fiction"; delivered a memorable monologue about a gold watch
Danced for the first time in a feature in James Ivory's "Roseland"
Debut as playwright (also starred) with one-man, off-Broadway production "Him"
Displayed his dancing abilities to great effect as the oily villain in "Pennies From Heaven"
Film debut, a bit part in "Me and My Brother"
First film in a lead role, "The Happiness Cage"
Had title role in NYSF's production of "Coriolanus"
Offered an over-the-top comedic performance as an effete turn-of-the-century drama critic in John Turturro's "Illuminata"
Played the nemesis sergeant to a wisecracking new recruit in the film adaptation of Neil Simon's "Biloxi Blues"
Portrayed Chance Wayne to Irene Worth's Alexandra del Largo in Tennessee Williams' "Sweet Bird of Youth"
Reprised role of Gabriel in the sequel "Prophecy II: Ashtown"
Returned to the stage in the Mike Nichols-directed "The Seagull"; presented by the New York Shakespeare Festival in Central Park
Starred in the stage play "Kid Champion"
Voiced the character of Cutter in the animated "Antz"
Cast in the chorus of "Baker Street"; first role billed as 'Christopher' Walken
Acted in the remake of John Water's "Hairspray" as Edna Turnblad's (John Travolta) husband Wilbur
Cast opposite Adam Sandler in the comedy "Click," directed by Frank Coraci
Danced in the popular Fatboy Slim music video "Weapon of Choice"
First of several films with director Abel Ferrara, "The King of New York"
Made third telefilm with Glenn Close, "Sarah, Plain and Tall: Winter's End" (CBS)
Offered a wildly over-the-top cameo as an exterminator in the comedy "Mouse Hunt"
Played "Macbeth" at the NYSF's Public Theatre
Re-teamed with Cimino for the controversial "Heaven's Gate"
Returned to Broadway in the black comedy "A Behanding in Spokane"; earned Tony Award nomination for Leading Actor in a Play
Returned to the NYC stage for the musical "James Joyce's The Dead"; received Tony nomination as Actor in a Musical
Starred opposite Jack Black and Ben Stiller in the comedy "Envy"; directed by Barry Levinson
Won an Oscar for his memorable turn as a soldier serving in Vietnam in Michael Cimino's "The Deer Hunter"
Cast in ensemble crime comedy "Seven Psychopaths"
Co-starred with Al Pacino and Alan Arkin as aging con men in crime comedy "Stand Up Guys"
Co-starred in adult comedy "Father Figures"
Appeared in the romantic comedy "The Wedding Crashers," starring Owen Wilson and Vince Vaughn
Acted opposite Dennis Hopper in "True Romance"; scripted by Quentin Tarantino; his so-called "Sicilian scene" hailed by critics as the best scene in the film
Cast as Gabriel, the evil leader of renegade angels in "The Prophecy"
Offered memorable cameo as Diane Keaton's brother in "Annie Hall"
Played the father of the youngest man to make the FBI's 10 Most Wanted List (Leonardo DiCaprio) in "Catch Me If You Can"; received an Oscar nomination for his supporting role
Made first appearance with the New York Shakespeare Festival (NYSF) in "Measure for Measure" in Central Park
Portrayed the villain out to destroy Sillicon Valley in the James Bond adventure "A View to a Kill"
Appeared in the big screen musical "Jersey Boys"
Appeared in the biopic "Eddie the Eagle"
Voiced King Louie on Disney's "live action" "Jungle Book" remake