Isherwood has worked with
Joel Cohen,
William Christie,
Peter Eötvös,
Paul McCreesh,
Nicholas McGegan,
Kent Nagano,
Zubin Mehta and
Gennady Rozhdestvensky as well as composers
Sylvano Bussotti,
Elliott Carter,
George Crumb,
Hans Werner Henze,
Mauricio Kagel,
György Kurtág,
Olivier Messiaen,
Giacinto Scelsi,
Karlheinz Stockhausen, and
Iannis Xenakis in venues such as La Scala, Covent Garden, the
Théâtre des Champs-Élysées,
Salzburg Festival,
Concertgebouw,
Berlin Staatsoper,
Vienna Konzerthaus,
Tanglewood). Beside the Stockhausen works mentioned above, his other
operatic roles include: "Antinoo" in
Monteverdi’s ''
Il ritorno d'Ulisse in Patria with Boston Baroque; "Claudio" in Handel’s Agrippina with Nicholas McGegan; "Satiro" in Rossi’s Orfeo
and "Pan" in Marais’ Alcyone'' with
Les Arts Florissants; "Joas" in
Porpora's
Il Gedeone with Martin Haselböck; "Frère Léon" in Messiaen's
Saint François d’Assise in the last composer supervised production; "Der Tod" in the two productions of
Viktor Ullmann’s
Der Kaiser von Atlantis with the
Internationale Bachakademie Stuttgart and 2e2m, "Roméo" in Black Madea
Dusapin’s
Roméo et Juliette at the
Avignon Festival; "Lear" in
Toshio Hosokawa’s
Vision of Lear for the
Munich Biennale; "Il Testimone" in
Sylvano Bussotti’s
Tieste at the
Rome Opera, and "Micromégas" in
Paul Mefano's
Micromégas. Recent performances include the role of the doctor in Francesco Filidei's " L'Inondation" at the Opéra de Rennes and the Opéra de Nantes (fall, 2019). In addition to singing, Isherwood has had an extremely active pedagogical career. He has been engaged as professor (or assistant professor) of vocal music and/or music theater (opera) at institutions in France, Germany, and the United States, including the
IRCAM Summer Academy, Stockhausen-Kurse (Kürten, Germany),
State University of New York,
University of Notre Dame,
Ecole Normale de Musique (Paris),
California Institute of the Arts, and the
University of Oregon (2008–2011). From 2015 to 2018, he was a professor of voice at the CNSMD de Lyon, and he has been professor of voice at the Conservatoire de Montbéliard since 2019. He has presented masterclasses, workshops, and lectures at the Salzburg
Mozarteum; Iannis Xenakis Summer Courses (Paris); Conservatoire de Reims;
Paris Conservatoire (CNSMP),
California State University, Los Angeles;
Stanford University;
University of California, Berkeley;
University of California, Santa Barbara;
University of Washington;
San Francisco State University;
California Institute of the Arts; ARIAM (Paris);
Conservatorio Giuseppe Verdi (Milan); Institute of the Living Voice (Berlin); Troyes Conservatoire; Mexico City University; Normal University of Taiwan; at
CCMIX (Paris); IRCAM (Paris); USC; Cal State LA; Cal State Riverside; Cal State Fullerton; Harvard University. Among his publications,
The Techniques of Singing describes the techniques needed to perform contemporary vocal music. ==Discography==