Mark has served as the medical director for Northeast Business Group on Health since early 2018. Until 2017, he served as senior director, Global Solutions Center and head of occupational medicine at Johnson & Johnson, Inc. At J&J, Mark led a team of experts covering occupational medicine; health and wellness; personal energy management; EAP and mental wellbeing; and work-life effectiveness. He also supported regional operational groups delivering health services to 135,000 employees in 120 companies.

Prior to seven years at J&J, Mark spent 17 years at GlaxoSmithKline in both London and Philadelphia, including as head of global operations, employee health management. Mark also has his own consulting practice, Worldwide Health Consulting LLC, where he has been largely focused on pandemic management for a number of organizations, and supporting handling of highly potent pharmaceuticals.

Mark received his MB ChB, Bachelor of Medicine and Bachelor of Surgery at Manchester University in the UK. He is a Fellow of both the American College of Occupational & Environmental Medicine, and the Faculty of Occupational Medicine, London.