Benedict was born in Burbank, California. He moved to Europe with his family in the 1960s. He was of half French descent. His theatrical credits include The Rocky Horror Show in the Kings Road in the early 1970s, Harold Pinter's production of Sweet Bird of Youth, The Reverend Lee in The Foreigner and Riccardo in Franco Zeffirelli's production of Filumena in which he played opposite Pierce Brosnan in the latter's first stage role, and Bill Wilson, co-founder of Alcoholics Anonymous, in a touring production of "One Day at a Time". In 2013 he appeared opposite Steven Berkoff and Andree Bernard in the world premiere of the former's one act play An Actor's Lament at The Berkoff Performing Arts Centre at Alton College, followed by a second performance at The Sinden Theatre, Homewood School, Tenterden in Kent, two nights at The Maltings Theatre & Cinema in Berwick-upon-Tweed and then a three-week run at the Assembly Hall in Edinburgh as part of the Edinburgh Festival Fringe. In May 2014, it was revived with a short run at the Theatre Royal, Margate with a further one-week run scheduled at The Gaiety Theatre, Dublin, in September 2014.