Kevin Quarmby first appeared professionally at the Cambridge Arts Theatre in 1972. He played the title role in the British premiere of Howard Sackler's The Great White Hope at the Tricycle Theatre Kilburn, and Lennie in Steinbeck's Of Mice and Men at the Swan Theatre, Worcester. For several years Quarmby was a National Theatre player, under the direction of Sir Richard Eyre, appearing in productions of Guys and Dolls, The Beggars Opera and Schweyck in the Second World War. Prior to joining Eyre at the National, Quarmby worked with Eyre in Jonathon Pryce's 1980 Hamlet at The Royal Court. In the same year, Quarmby appeared at the Old Vic in the infamous Peter O'Toole Macbeth, as well as in The Merchant of Venice starring Timothy West and Lancelot and Guinevere. Other parts include the Duke of Albany in King Lear at the Ludlow Shakespeare Festival, Charles the Wrestler in As You Like It and the Baron and Grand Inquisitor in Bernstein's Candide for Birmingham Rep at the Edinburgh Festival, and Camillo in Phyllida Lloyd's The Winter's Tale at Manchester's Royal Exchange Theatre. In London's West End, Quarmby played Lieutenant Schrank in West Side Story, following his appearance in the Lindsay Kemp Company with the tragicomedic Varieté, and his portrayal of the circus showman, Otto Ziegler. In 2006, Quarmby portrayed Harold Macmillan in the British premiere of Eden's Empire at the Finborough Theatre, London. 2008 saw him appearing as the Earl in Thomas Dekker and John Webster's Westward Ho! at the White Bear Theatre, Kennington, as well as directing a production of William Walton's comic opera The Bear for the Greenwich Opera Ensemble, featuring his daughter, mezzo-soprano, Belinda Williams. In 2009 he played the Coroner, Sir Michael Wright, in Stockwell: The Inquest into the Death of Jean Charles de Menezes at the Landor Theatre, which transferred to the Tricycle Theatre later that year. He has since performed in several Globe Theatre 'Read Not Dead' productions of rarely-performed early modern drama, as well as staged readings of new writing for the Royal Academy of Dramatic Art (RADA). Quarmby is a proud member of the Actors' Equity Association (AEA) in the USA, and its UK counterpart, British Actors' Equity.



On television, Quarmby played policemen and villains in cult TV shows of the 1980s and '90s like The Professionals, Dempsey and Makepeace, The Bill, London's Burning, Wycliffe, Cracker, and Linda La Plante's Trial and Retribution IV. He caused several deaths as the corrupt sports promoter, Edwin Finney, in Casualty. In the TV movie, Sherlock Holmes and the Leading Lady, Quarmby was the Bosnian terrorist, Kosich. Kosich kidnaps the beautiful Morgan Fairchild, but is shot dead by Holmes, in this instance played by Christopher Lee. Quarmby also appeared in comedy cameo roles in Hot Metal, Beast, Annie's Bar and The Punt and Dennis Show.In the 2000s, Quarmby delivered Soames's daughter Fleur in the acclaimed drama, The Forsyte Saga, and played an irascible farmer in Heartbeat.