Dr. David Systrom is a member of the Brigham and Women’s Hospital pulmonary and critical care faculty and Assistant Professor of Medicine at Harvard Medical School where he directs the Dyspnea Clinic and the Advanced Cardiopulmonary Exercise Testing Program. He has been on the Harvard faculty for over 35 years during which time he has received NIH, AHA, Department of Defense, Dysautonomia International and OMF funding to study various forms of exercise intolerance. Over the past five years, he has used invasive cardiopulmonary exercise testing to investigate mechanisms underlying fatigue, shortness of breath and orthostatic intolerance in ME/CFS and PASC. His recent work suggest commonality between the two, in particular neurovascular dysregulation and related hyperventilation underlying symptoms during exercise. He is the Principal Investigator of an ongoing $8 million study of limb skeletal muscle mitochondrial dysfunction and just completed the first ever randomized clinical trial pyridostigmine, both in ME/CFS.