Alexandra Hewson studied music at the Geneva Conservatory of Music, where she was a pupil of Danielle Borst for 3 years. After obtaining her BA, she did a Master's in singing with Jeannette Fischer at the Lausanne Conservatory.

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In her most recent recitals she has sung David in Scarlattiʼs Davidis, pugna et victoria, Mozartʼs C Minor Mass, the Fauré Requiem, the Brahms Requiem, the Poulenc Gloria, Pergolesiʼs Stabat Mater, and various Bach Cantatas, conducted by Gabriel Garrido, Philippe Huttenlocher and Ton Koopman. In 2012, she participated in the UNICEF Gala concert celebrating Mozart at the Victoria Hall in Geneva, and she sang with Jean-Claude Malgoire in Tourcoing and at the Théâtre des Champs Elysées in a concert version of Dido and Eneas (H. Purcell) and Venus and Adonis (J. Blow).

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On stage, her first operatic parts were Damigella in Monteverdiʼs Coronation of Poppea, Lucy in Menottiʼs The Telephone, ou lʼamour à trois, Eurydice in Offenbachʼs Orphée aux Enfers in Geneva, and Amore in Gluckʼs Orfeo ed Euridice in Lausanne. In January 2013, the Lausanne Opera engaged her for the part of the Princess Badr’al-Budur in Nino Rota's Aladin et la lampe merveilleuse directed by Hervé Klopfenstein and staged by Waut Koeken. She debuted at the Royal Opera of Wallonie as Blondine in a French production of Die Entführung aus dem Serail in February 2014 (conducted by Massimo Donadello and staged by Yann Dacosta) and in December 2015 at the National Opera of Lorraine in Nancy as Eurydice in Offenbach's Orphée aux Enfers (conducted by Laurent Campellone and staged by Ted Huffman).

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Alexandra took part in the Claves Record label recording of Frank Martin’s Das Märchen vom Aschenbrödel ballet as the Kleine Schwester, conducted by Gábor Takács-Nagy.