Dr. Mark Rosner is a board certified Emergency Physician and has been in practice for over 25 years. He has been the Director of Education and Research at Vision Specialists Institute and has been actively involved in Binocular Vision Dysfunction (BVD) research since 2005. He is a co-author of a peer reviewed article on TBI and Vertical Heterophoria (VH) and has presented lectures and posters on this topic locally, nationally and internationally. He has helped develop and validate the questionnaire that identifies patients that most likely have BVD (the BVDQ). He has co-authored a book on VH patients with Dr Feinberg.