Since then he has established a strong presence on the international stage with a busy series of debuts and return engagements, including the London Philharmonic Orchestra, City of Birmingham Symphony Orchestra, Detroit Symphony Orchestra, Rotterdam Philharmonic Orchestra, Royal Scottish National Orchestra, Orchestre Philharmonique du Luxembourg, Tampere Philharmonic, and Bruckner Orchester Linz. In the 2024/25 season he made further debuts with the Gulbenkian Orchestra in Lisbon, Maggio Musicale in Florence, and the Osaka Philharmonic, working with soloists such as Imogen Cooper and Cédric Tiberghien, and in 2025/26 he looks forwards to debut engagements with Welsh National Opera, Orchestre Philharmonique Royal de Liège, Orchestre de Chambre du Luxembourg, as well as returns to Glyndebourne and Opera Holland Park.Other recent highlights have included concerts with Orchestre National de Lille at BOZAR in Brussels, a tour with Phion Orkest culminating with Bertie’s debut in the Amsterdam Concertgebouw, St Louis Symphony Orchestra, New Japan Philharmonic, and Teatro Regio Torino.

Also active on the operatic stage, Bertie co-founded and has been Music Director of Waterperry Opera Festival since 2017.  There he has conducted acclaimed productions of all the Mozart/da Ponte operas, Donizetti’s L’elisir d’amore, Bizet’s Carmen, and Britten’s The Turn of the Screw.  He made his Glyndeboune Festival debut in 2023, stepping in at four hours’ notice to conduct L’elisir d’amore, and has returned every season since then.  Further opera productions include Handel's Semele at Opera Holland Park, and his own Paradise Lost, performed to sell-out audiences in London in 2022.Bertie works regularly in the world of historically informed performance – recently conducting the Orchestra of the Eighteenth Century in performances and radio broadcasts of Clara Schumann’s Piano Concerto – including directing from the harpsichord for Waterperry’s annual Messiah performances, Bach’s St John Passion, and forthcoming performances of the St Matthew Passion and Mass in B minor.Bertie was born in Oxford and studied the cello and piano before moving towards conducting and composition.  He read music at the University of Cambridge and subsequently studied conducting at the Royal Academy of Music with Sian Edwards.  As an assistant conductor Bertie worked closely with artists such as Lahav Shani, Sir Mark Elder, and Mirga Gražinytė-Tyla on major international tours; he also served as cover conductor for the Dallas and St Louis Symphony Orchestras.

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