Mark is an award-winning, American Renaissance Man. His YouTube Channel has millions and millions of views and tens of thousands of followers. His performing career spans more than 35 years, including 100+ stage productions, and more than 100 film and tv projects. He has worked in 53 countries and due to his truly unique, extremely versatile singing voice, has recorded 39 CDs in every conceivable musical style.

Mark started his career started as a classically-trained operatic tenor. While singing 40+ leading roles in operas and operettas, he continued studying acting for 10 years with a member of NY's famed Actor's Studio. He has shared the stage, screen and microphone with Legends and Icons such as Frank Sinatra, Liza Minelli, Bill Cosby, Chick Corea, Jody Watley, Jon Secada, Rock ‘n’ Roll Pioneer Bo Diddley, Reggae Stars Black Uhuru; operatic Superstars such as Cecilia Bartoli, Edita Gruberova, Francisco Araiza, Anna Moffo and Alfredo Kraus; Tony-Award Winners/Nominees like Liz Callaway, Debbie Gravitte, Kiril Kulish and Judy Kaye; as well as Hollywood luminaries like Anne Bancroft, Michelle Pfeiffer, and Alec Baldwin, among others.

Some of the honors he has received over his lifetime include a study grant from the Puccini Foundation to further his operatic career; as well as being the first recipient of the Fleischer Music Prize from the City of Leipzig, Germany for his contributions to music and culture. For his work as writer/ director/lyricist and as Tony Finelli in The Finellis Movie (available on Amazon Prime & Apple TV, among others) Mark received more than 40 award nominations in multiple categories, and won 18 prizes at international film festivals. In 2024, "The Finellis Musical" (which was based on Mark's award-winning comedy The Finellis Movie), celebrated its world premiere at Wonderville in the heart of London's West End. Ulf Weidmann, Mark's longtime writing partner wrote the music for both the film and the musical, and Mark was responsible for the musical's book, lyrics and direction.

He has lived in 13 countries and is tri-lingual (English, German and Dutch). Mark has been vegan since 2004 and advocates for a plant-based lifestyle.