Damon was born in Brooklyn, New York, the son of Marvin Leonard Zonis, who was a manufacturer.^[1] Damon's parents were Russian Jewish immigrants who made their home in America after fleeing the Bolshevik Revolution.^[2][3]

After a series of roles on Broadway, Damon's appearance as the Prince in the 1965 version of Rodgers and Hammerstein's Cinderella starring Lesley Ann Warren helped pave the way to a long career in television soap opera. That same year, he had a prominent featured role in the Broadway musical Do I Hear a Waltz? written by Richard Rodgers (music) and Stephen Sondheim (lyrics). He had earlier appeared in an Off-Broadway revival of The Boys From Syracuse with music by Rodgers and lyrics by Lorenz Hart. Damon is prominently featured on the cast albums of these musicals, as well as the hit Irma La Douce (1960).

Moving to Great Britain, Damon starred in the hit West End musical Charlie Girl with Anna Neagle in 1965,^[4] and was selected to appear as American secret agent Craig Stirling, alongside British actors Alexandra Bastedo and William Gaunt, in the ITC series The Champions.^[5] He also appeared with Roger Moore in an episode of The Saint which has been credited as the inspiration for the later series The Persuaders!, with Damon's role being played by Tony Curtis. In 1968, he appeared in the BBC TV adaptation of The £1,000,000 Bank Note and played Henry Adams in the starring role. Damon also played magician Harry Houdini in a lavishly staged London musical, Man of Magic.^[6] In 1970 Damon released an LP called Stuart 'Champion' Damon recorded on Reflection records REF L7 which failed to chart.

In the 1970s, he was cast alongside Gene Barry and Catherine Schell for the series The Adventurer, appearing briefly in two episodes. Damon later spoke candidly about the fact that Barry did not want him in the series because of his height:^{[citation needed]} at over six feet, he towered over the shorter Barry. After acting roles in several other British television series, including Thriller, The New Avengers, The Main Chance and children's series The Adventures of Black Beauty where he played a hypnotist, he returned to the United States.

In September 1974 he appeared as a solo singer in an episode of the UK TV variety programme The Wheeltappers and Shunters Social Club. The Champions theme tune was used as his walk-on music.^[7]

In 1977, he began his best known American role, as Dr. Alan Quartermaine Sr. on General Hospital. He also repeated the role on the short-lived GH spin-off Port Charles (1997–2003).

In 1999, Damon won the Best Supporting Actor Emmy, for his portrayal of Alan, a physician addicted to the painkiller hydrocodone. In 2005, Damon was reunited with Alexandra Bastedo and William Gaunt for the first time in almost 40 years, to provide audio commentary on a DVD release of The Champions. In December 2006, it was reported that Damon had been fired from General Hospital by Jill Farren Phelps, on the orders of Anne Sweeney and Brian Frons,^[8] and his last air date was scheduled for February 26, 2007, when his character died. The reason behind his release was not made public.^[9] The taping of the final scene occurred on February 5, coincidentally Damon's 70th birthday.^[10] Fellow actors on General Hospital spoke to the press about how upset they were over Damon's firing, with Damon's on-show wife Leslie Charleson saying, "This is the 30th anniversary for the two of us, in August. The timing leaves me very discouraged about the way soaps are going, the total disregard for history and the blatant disregard for the veterans."^[11]

Despite the death of the character, Damon had remained on the show, playing the ghost of Alan Quartermaine, haunting his sister Tracy about forging Alan's will. He remained with the show until December 23, 2008, when Alan appeared to Monica on Christmas to tell her that he loved her.

On September 18, 2009, Damon began appearing on As the World Turns as Janet and Teri Ciccone's "Uncle" Ralph Manzo, a businessman most likely involved with the mob. He left the series on October 30, 2009, but returned August 23-25, 2010. From March 19–25, 2010, Damon played the role of Governor Jim Ford on Days of Our Lives.

Damon returned to General Hospital for two episodes (August 26, 2011, and August 29, 2011), in which Alan appears in a fantasy sequence of Monica's. He returned again in November 2012 as a ghost when son AJ was announced to be alive, after son Jason's disappearance. He appeared, along with Rick Webber (Chris Robinson) and Emily Quartermaine (Natalia Livingston), as a hallucination shared by Tracy and Monica, for the show's 50th anniversary episode, which aired on April 2, 2013.

Damon married Deirdre Ann Ottewill, a former actress, singer, and dancer on March 12, 1961. They had two children, Christopher and Jennifer Zonis. Damon died of kidney failure^[12] on June 29, 2021, aged 84, at the Motion Picture & Television Fund retirement community in Los Angeles, where he had lived for seven years. Deirdre died on December 25, 2019, from Alzheimer's disease.

Broadway edit

• First Impressions – 1959
• From A to Z – 1960
• Irma La Douce – 1960
• Do I Hear a Waltz? – 1965

Off-Broadway edit

• Entertain a Ghost – 1962
• The Boys from Syracuse – 1963

West End edit

• Charlie Girl – 1965
• Man of Magic (as Harry Houdini) – 1968

Film edit

• A Touch of Class (1973) - Man Hailing Cab at End (uncredited)
• Young Doctors in Love (1982) - Soap Cameos
• Star 80 (1983) - Vince Roberts
• Silent Assassins (1988) - General
• Chairman of the Board (1998) - Doctor
• Rain from Stars (2013) - Edward (final film role)

Television edit

• Cinderella (1965, TV Movie) - Prince
• Man in a Suitcase (1967) - Williams
• The £1,000,000 Bank Note (1968) - Henry Adams
• The Champions (1968-1969) - Craig Stirling
• The Saint (1969) - Rod Huston
• UFO (1971) - Howard Byrne
• The Adventurer (1972-1973) - Vince
• The Adventures of Black Beauty (1973) - Mr. Duncan
• A Touch of the Casanovas (1975, TV Movie) - Casanova
• The Main Chance (1975) episode "Payment by Result" - Allan Hartmann
• Thriller: Nightmare for a Nightingale (1976)
• Space: 1999 (1975-1977) - Guido Verdeschi / Parks
• Yanks Go Home (1976-1977) - Cpl. Vince Rossi
• The New Avengers (1977) - Marty Brine
• General Hospital (1977–2013) - Dr. Alan Quartermaine
• Fantasies (1982, TV Movie) - Hanson
• Fantasy Island (1982-1983) - Richard Mallory / Dr. Randolph
• Legend of the Champions (1983, TV Movie) - Craig Stirling
• America (1985–1986) - Self - Host
• Mike Hammer (1987) - Graham Richardson
• Perry Mason: The Case of the Killer Kiss (1993, TV Movie) - Alex Straub
• Me and My Hormones (1996) - Bill
• Port Charles (1997–2001) - Dr. Alan Quartermaine
• As the World Turns (2009–2010) - Ralph Manzo
• Days of Our Lives (2010) - Governor Jim Ford

Recording edit

• Stuart Champion Damon, Reflection Records 1970

• Stuart Damon at IMDb
• Stuart Damon at the Internet Broadway Database  
• Stuart Damon at the Internet Off-Broadway Database
• Portraits of Stuart Damon at the National Portrait Gallery, London