Nicholas Isherwood has sung in the world's leading festivals (Salzburg, Aix, Festival d'Automne, Avignon, Almeida, Biennale di Venezia, Holland Festival, Munich Biennale, Wien Modern, Händel Festivals in Göttingen and Halle, Tanglewood, Ravinia, etc.) and opera houses (Royal Opera House, Berlin, Frankfurt, Stuttgart, Amsterdam, Lyon, Châtelet, Théatre des Champs Elysées, Rome, Torino, Genova, La Fenice, La Scala, etc.), working with conductors such as Roberto Abbado, Joel Cohen, William Christie, Peter Eötvös, Gabriele Ferro, Nicholas McGegan, Paul McCreesh, Zubin Mehta, Kent Nagano, Helmuth Rilling, David Robertson and Gennadi Rozhdestvensky. Isherwood has worked closely with composers such as Sylvano Bussotti, Elliott Carter, George Crumb. Hans Werner Henze, Mauricio Kagel, György Kurtág, Steve Lacy, Olivier Messiaen, Giacinto Scelsi and Iannis Xenakis. He collaborated with Karlheinz Stockhausen for 23 years. He has improvised with Steve Lacy, Joelle Léandre, David Moss and Sainkho Namtchilak.  He has made over 65 compact discs for labels such as Erato, Naxos, Stockhausen Verlag and Harmonia Mundi and has appeared in three films for television.  Isherwood has taught master classes and lectured at schools such as the Paris Conservatoire, the UdK in Berlin, the Salzburg Mozarteum, USC, Harvard, Stanford and the Milan Conservatory and been visiting professor of singing at numerous universities.  He is Professor of Singing at the Montbéliard Conservatory. Publications include articles for The Journal of Singing, Vox Humana and LIM and a book for Bärenreiter Verlag.