Bertie studies with Sian Edwards at the Royal Academy of Music. He is the conductor of the London Young Sinfonia and the Percival Ensemble, a chamber orchestra dedicated to performances of small-scale late nineteenth- and early twentieth-century repertoire. He works frequently with ensembles in London and Cambridge including Helios Opera, Covent Garden Chamber Orchestra, and Cambridge University Opera Society; other groups he has worked with include the Britten Sinfonia, London Sinfonietta, and the National Youth Orchestra,
Bertie’s repertoire ranges from Bach orchestral suites, through classical and romantic symphonies, to twentieth- and twenty-first-century works by composers such as Stravinsky, Bartók, and Walton, and his own compositions. Equally at home with opera he has recently conducted productions of Mozart's Bastien und Bastienne and Le nozze di Figaro, and Short stories: world premieres of three new chamber operas . He has taken part in masterclasses with Peter Stark, Paul Brough, Nicholas Cleobury, Pierre-André Valade, and John Traill.
Additionally Bertie frequently conducts the choir of St Marylebone Parish Church, London, and is much in demand as a conductor of other choirs and choral societies.
Bertie is always keen to learn new repertoire and forthcoming projects include a touring production of Mozart's Cosi fan tutte, and Mahler's Fourth Symphony with the London Young Sinfonia.