Bayless was born in Hackney, London. Her family was evacuated to Blackpool during the Second World War, where she started to take singing lessons. She later trained at the Italia Conti Academy of Theatre Arts. Early in her career, she performed in pantomimes at the London Palladium.
In 1955 she was a replacement, starring as Polly in the Broadway production of The Boy Friend (credited as Jo Ann Bayless), and she starred as Maria in the original West End production of The Sound of Music in 1960. She played the role of Cynthia Cunningham in the early 1970s in the soap opera Crossroads. She also performed with Audrey Hepburn in Sauce Tartare.
Jean Bayless has not appeared on Broadway.
Jean Bayless has appeared on London's West End in 1 shows.
Jean Bayless's first West End show was The Sound of Music which opened in 1961
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