Mark has worked with people with disabilities for over 35 years, primarily centered around developing mobility and seating products and providing education on mobility products and delivery. Mark is former Global VP of Product Development of Rehab for Invacare Corporation, where he worked for 27 years. He was responsible for leading engineering and marketing teams in the development and marketing complex rehab products including power and manual wheelchairs, seating and positioning. He currently consults on product development for Convaid, a manufacturer of pediatric mobility, and Ride Designs, a manufacturer of Custom and Modular seating. His non-profit international work includes developing and executing wheelchair projects in Colombia, Jordan, Nicaragua and Iraq. In a two-year project, Mark developed and managed the "Wheelchairs Taking Off" project for CIREC, teaching technicians how to repair and adapt donated wheelchairs and how to launch small businesses based on wheelchair repair.