Among the orchestras with whom Ian Brown has appeared as soloist are the BBC Symphony Orchestra, the Academy of St Martin in the Fields, the BBC Philharmonic and the Bournemouth Symphony Orchestra. With the London Sinfonietta, he has played concertos by Falla, Hans Werner Henze and the Elliott Carter Double Concerto. Other highlights have been Mendelssohn's First Piano Concerto in the Vienna Musikverein, and Messiaen's "Oiseaux Exotiques" at the Proms.
Ian Brown made his London debut as a conductor in a performance of Mahler's "Resurrection" Symphony in the Barbican. He has conducted the London Mozart Players, The English Chamber Orchestra, the Bournemouth Symphony Orchestra, and the Scottish Chamber Orchestra. He has worked in Poland with the Leopoldinum Orchestra of Ostrava. He has appeared at the Edinburgh, Israel and Cheltenham Festivals and conducted a Peter Maxwell Davies premier at the Orkney Festival.
In 1978, Ian joined the Nash Ensemble with whom he has played and recorded a large repertoire of chamber music. He has made more than 60 recordings with them, including the Mozart piano Quartets, Beethoven Piano and Wind Quintets, the Mendelssohn Piano Trios, the Brahms Piano Quartets, a double CD of the works of Saint-Saens and Poulenc.