Marcus has broadcast as a soloist on BBC Radio 3, played chamber music with Peter Donohoe, Paul Lewis, Peter Hill, Emmanuelle Haim, Alina Ibragimova, Leon McCawley and with Thomas Adès in music by Adès at Carnegie Hall. He has performed chamber music at the Wigmore Hall, Purcell Room, Bridgewater Hall, Symphony Hall Birmingham, the Library of Congress in Washington, and at the Haydn String Quartet Festival, Esterhazy. Marcus has played for several years in Sir John Eliot Gardiner’s Orchèstre Révolutionnaire et Romantique, including last year as Principal 2nd Violin at the Opéra Comique in Paris.
Marcus has guest led Ensemble Modern Frankfurt, Musikfabrik Köln, City of Birmingham Symphony Orchestra, Royal Liverpool Philharmonic Orchestra and the Birmingham Contemporary Music Group. Marcus is also a composer and recently held the 2008 John Clementi Collard Fellowship for composition from the Worshipful Company of Musicians. He is married to the pianist Christina Lawrie, and they play together as a duo in recital.