John studied at the Royal College of Music as a scholar under professor Rodney Friend, one of the great concertmasters.

John is leader of the Sinfonia of London under John Wilson, with whom he has released more than twenty highly acclaimed records. John is also associate leader of the English Chamber Orchestra. He works as a regular guest leader with groups including the London Symphony Orchestra, Philharmonia, Royal Philharmonic Orchestra, Royal Liverpool Philharmonic, London Mozart Players, BBC Scottish Symphony Orchestra, Royal Scottish National Orchestra, English National Opera and others.

John is best known as a chamber musician for twenty-four years with the highly acclaimed Tippett Quartet; performing, and broadcasting across the UK and worldwide. They have recorded extensively, releasing over fifty discs with the quartet for EMI, Decca, Somm, Naxos, Signum, Classic FM and others.

John has a fine reputation as a soloist, appearing with the English Chamber Orchestra and performing double concerti with Maxim Vengerov, and with Stephanie Gonley around the UK and abroad. Over the last twenty-five years John has been performing and broadcasting the major violin repertoire worldwide including performances at the Liszt Hall in Budapest and concerts across New Zealand. Other recent performances include Brahms, Glazunov, Richter Vivaldi Recomposed and Elgar concerti, Erollyn Wallen’s concerto gross with the Refugee Orchestra project and Bach with the English Chamber Orchestra around the UK.

John is a regular orchestra leader in commercial music. His studio work includes leading soundtrack sessions for The Batman, Jurassic World, Nightmare Alley, Disney’s Beauty and the Beast, Mary Poppins Returns, The Little Mermaid, Matilda, and Marvel’s Doctor Strange. He has worked closely with composers including Michael Giachinno, Marc Shaiman and Alan Menken. The Tippett Quartet is heavily featured on the soundtrack for the movies Knives Out, Glass Onion and Wake up dead man by director Rian Johnson.

John plays on a c.1720 violin by Francesco Goffriller of Venice.