John Denis Ingvar Jansson was born in Torquay, Devon, the son of a Swedish musician and an English singer.
[1][2] John Jansson has conducted several productions at the Royal National Theatre, among them Sondheim's Sunday in the Park with George (Olivier Award) and Brecht's The Resistible Rise of Arturo Ui (with Antony Sher).
At the Royal Opera House's Linbury Studio Theatre he conducted the London premiere of John Adams's I Was Looking at the Ceiling and Then I Saw the Sky (also at the Huddersfield Contemporary Music Festival), and he was the conductor for Bernstein's Trouble in Tahiti and Barber's A Hand of Bridge (Southwark Playhouse), Marc Blitzstein's The Cradle Will Rock (Battersea Arts Centre) and Mel Smith's The Gambler (Jermyn Street Theatre).
He was also the artistic director of the Blue Rider Ensemble, formed whilst still a student, giving many premières including works by William Walton, James MacMillan, John Tavener and Toru Takemitsu.
With the Opera24 company, he conducted Così fan Tutte for the 2013 Grimeborn festival, as well as the revival of that production this year.