Mark is currently principal horn of the San Francisco Opera Orchestra, a position he has held since 2016. He was formerly third horn of the Philharmonia Orchestra and recently won the Associate Principal horn position with the San Francisco Symphony which he is due to start in the Fall. He graduated from Cambridge and Oxford Universities and worked as a hospital doctor specializing in pulmonology for ten years prior to 2016 and has a PhD in pandemic influenza from Imperial College, London. He is also currently working on SARS CoV2 research as PostDoctoral research scholar at the University of California San Francisco.