His West End credits include Sweeney Todd at Drury Lane, Jeeves Takes Charge at the Fortune Theatre and Cats at the New London Theatre, where Stephen was the Production Vocal Director for 12 years. He has also appeared at many Festivals both at home and abroad, including Edinburgh, where he sang the role of the Italian Tenor in Der Rosenkavalier. Stephen has appeared as soloist for many BBC Radio 2 programmes, including Songs from the Shows and Friday Night is Music Night.

For many years Stephen directed his vocal group, The Stephen Hill Singers, who made frequent recordings for radio, television and films. They also appeared on The Royal Variety and Children's Royal Variety Shows, and were the backbone for the BBC Radio 2 series of musicals in which Stephen appeared in all 24 editions, either as Vocal Director or in one of the lead roles. His most notable credits include The Caliph (Kismet), Mr Erlanson (A Little Night Music), Ceruti (The Dancing Years), Carshott (Half a Sixpence), Harry (My Fair Lady), Peter (Jesus Christ Superstar), Uncle Jeff (Mame), Ralph (Kiss Me Kate), Larry (A Chorus Line) and Roscoe in Stephen Sondheim's Follies which was recorded live at Drury Lane in the presence of the composer.

Very much in demand as a vocal coach, director and arranger, Stephen is Choral Director of the Music Theatre Degree Course at the Royal Academy of Music.