Metropolitan Opera singers Mark has worked with
Include the following:
- David Cangelosi
- Philippe Castagner
- John Michael Moore
- Michael Myers
- Zurab Ninua
- Amanda Pabyan
- Rodion Pogassov
- Franco Pomponi
- Morris Robinson
- Mark Schowalter
- Jordan Shanahan
- Michael Todd Simpson
- Garrett Sorenson
- Donovan Singletary
- Noah Stewart
- Stephan' Szkafarowsky
- Russell Thomas
- Alfred Walker
- Jeffrey Wells
- Richard Zeller