Mark is an Associate Professor and Director of the Continuing Education Program in the Department of Rehabilitation Science & Technology at the University of Pittsburgh. He is the course director for the International Seating Symposium and directs several other continuing education venues, including web-based post-professional education and training.

Mark's area of research is in the development and application of functional outcomes measures, product development, and telerehabilitation. He is the co-developer of the Functional Mobility Assessment and manages a registry of large data related to mobility outcomes. He also has over 27 years of clinical experience at the Center for Assistive Technology at the University of Pittsburgh Medical Center.