He has been Principal Clarinetist with the Royal College of Music First Orchestra, the Berkshire Symphony (Massachusetts), Symphony New Brunswick, the PEI Symphony, the Charlottetown Festival Orchestra and Eb Clarinetist with the U.S. Air Force Band, appearing as soloist with all of these ensembles.
He has conducted numerous ensembles including the University of Michigan Concert Band, the Mount Allison University Symphonic Band, the Toronto Wind Orchestra and Symphony New Brunswick. He was the Conductor of the New Brunswick Youth Orchestra from 1994-2010 and performed with them at Carnegie Hall in New York City, in Italy, and in China. Dr. Mark has been the Artistic Director and Conductor of the Prince Edward Island Symphony since 2000.
Dr. Mark has worked professionally with, among others, Rivka Golani, Rita MacNeil, the Barra MacNeils, Measha Bruggergosman, Howard Cable, Nancy White, Sally Dibblee, Roger Lord, Anton Kuerti, Peter Allen, Richard Raymond, Marc Djokic, Denise Djokic Matt Andersen, Teresa Doyle and Jill Barber.
Dr. Mark was for many years Professor of Clarinet, Saxophone, and Conductor of the Symphonic Band at Mount Allison University, and is a former high school music teacher. He is an active clinician and adjudicator.