Cazalet is the son of Sir Edward Cazalet, a retired High Court judge, and his wife, Camilla, Lady Cazalet, formerly the Honourable Camilla Jane Gage, the daughter of a Viscount and a descendant of William I of England. His paternal grandfather was Major Peter Cazalet, the well-known racehorse trainer.
Cazalet attended the Dragon School in Oxford, England and Bryanston School in Dorset. Later he trained at the Guildhall School of Music in London and the Juilliard Opera Center, where he won the Shoshana Foundation Award.
In the course of his career, Cazalet has appeared at almost all of the the major operatic venues. His roles include Nicholas in Death and the Powers at the Monte Carlo Opera, Gerard in Les Enfants Terribles by Philip Glass’ at the Brooklyn Academy of Music Opera House, and Charles in The Music Programme at the Royal Opera House. His Lincoln Center concert debut was a performance of L'Infinito by Tristan Keuris. He has also performed with the New York Festival of Song at Weill Hall, at Carnegie Hall, and at the Wigmore Hall in London. He also performed as Mr Angel in The Impresario with the National Symphony Orchestra under Christopher Hogwood at the Kennedy Center. Other performances include Cascada in The Merry Widow with the English National Opera and Albert in Albert Herring with the Glyndebourne Touring Opera.
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- "Interview with Hal Cazalet, “Nicholas”". Opera of the Future. Retrieved October 8, 2011.
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