Professor, received his bachelors degree in physical therapy in June of 1987 from the Academie voor Fysiotherapie in Leiden, The Netherlands, his post-professional master's degree in physical therapy in August of 1998 from the University of St. Augustine, and his doctoral degree in education from the University of Central Florida in 2004. Dr. van Duijn received certification in manual therapy by the University of St. Augustine in 1992 and Board certification as an Orthopedic Clinical Specialist from the ABPTS in 1997, and received recertification in 2007. His current area of practice is in general outpatient physical therapy with a special interest in orthopedic manual therapy of the spine and the extremities.