 Haydn's piano studies culminated in a period during the 1990s when he studied in London with the renowned pianist, composer, and pedagogue Peter Feuchtwanger, who became his principal influence and mentor and in whose legendary International Masterclasses he assisted.Haydn considers this episode to be the most important in his musical development

Haydn has received both public and critical acclaim across Europe and Great Britain for his performances of a wide repertoire embracing Baroque through to contemporary works.His name became particularly associated with New Music; he has collaborated closely with several notable contemporary composers including Claus Gahrn, Hans G Leonhardt, Eric Schwartz, John White, Robert Coleridge, Michael Chant and others.