Doreen Killens is an orthopaedic musculoskeletal physiotherapist (FCAMT) with 40 years of clinical experience. For 25 years she was an instructor for the Canadian Orthopaedic Manipulative Division of the Canadian Physiotherapy Association, teaching manual therapy courses across Canada. In addition, she was an Examiner and former Chief Examiner for the same association. She is presently in private practice in Montreal and has a particular interest in the field of headaches and myofascial dysfunction. She is the developer of a physiotherapy approach to treatment of the myofascial body called Mobilization of the Myofascial System (MMS) (Upper Quadrant, Lower Quadrant and Advanced Integration). In addition, she teaches a two-level course system entitled Manual Therapy for the Cranium, courses she teaches across Canada and Europe, both in English and in French.