Robert Longden trained at Central School of Speech and Drama in London, where he won the John Gielgud Award.

His theatre credits include Riff Raff in the Jim Sharman production of The Rocky Horror Show at the Essoldo Theatre, King's Road; Mum in Steven Berkoff's original production of East; Gerald (sun has got his hat one) Bollingbroke in the original production of Me and My Girl at the Adelphi Theatre; Earl Williams in Windy City at the Victoria Palace Theatre; Douglas in Small Ads at the Young Vic; Deputy Director in Vaslav Havel's Temptation at the Westminster Theatre; Desmond in Small Family Business and Hortensio in Taming of the Shrew at the Haymarket Theatre, Leicester; Widow Twankay in Martin Duncan's panto Night in Old Peking at the Theatre Royal, Stratford East; Lomax in Christopher Marahan's Major Barbara at Chichester; Maddox Brown in Outside Broadcast at Birmingham Rep; The Director in Nightshoot at the Tricycle; Mr. Cellophane in Chicago at the Newcastle Playhouse and Dorothy Parker in Tallulah Who? at the Queen's Theatre, Hornchurch.

His film credits include Agatha, Adolph Hitler - My Part in his Downfall, Live on Arrival, Selling Hitler, Secret Life of Ian Fleming and Violent Summer. His television credits include leading roles in Moon & Son, The Blackheath Poisonings, The Gentle Touch, Watch All Night, Cost of Loving, Dickens of London, Danger UXB, Agony, Why Didn't They Ask Evans?; The Bretts, Singers Day, The Little Big Show, Single's Weekend, Video Stars and Cloud Nine. He played Mr. Pitt (the civil servant jazz fanatic) in Alan Plater's Beiderbecke Trilogy.

His radio credits include regular appearances in Legal Decent Hones and Truthful, Semi-Circles and Royal Favour. Robert has written a number of thriller screenplays, revues, musicals and several pop songs. As a director he founded, with Charlie Hanson, the Old Red Lion Theatre Club and the New Cornet Theatre, Battersea and created opening shows for the Old Profanity Showboat, Bristol as well as five shows for the New End Theatre, Hampstead.