For his own label, Cala Records, Geoffrey Simon has a series of records where he has brought together ensembles of single instruments—all violins, violas, cellos, double basses, horns, trumpets, trombones and harps—drawn from London's leading solo and orchestral musicians. The recordings have attracted interest among instrumentalists, composers and audiences worldwide.
He has conducted a Mahler cycle as Music Director of the Northwest Mahler Festival in Seattle. He is Classical Special Projects Consultant of Arts Global (London, New York and Montreux) and a jury member for Young Concert Artists (Paris, Leipzig and New York) and the Australian Music Foundation (London).