Associate Professor Chris O’Callaghan is a general physician and clinical pharmacologist with appointments at Austin Health and University of Melbourne. A/Prof O’Callaghan is a clinician researcher. He has undertaken laboratory and clinical studies in diverse areas of cardiovascular medicine. Studies have ranged from cell culture experiments that examined the role of adrenaline in regulating synthesis of collagen, to trials that determined the mechanism of cardiovascular neuro-humoral systems in regulating organ blood flow and drug clearance.  Along with his colleague, Dr Min Yin Goh, A/Professor O’Callaghan undertook the pivotal examinations that determined the effects of spinal cord injury on blood pressure control. Goh, O’Callaghan and others also published the first study to link joint hypermobility with anorexia nervosa.  A/Professor O’Callaghan has a vast experience caring for patients with disorders of blood pressure control, fatigue syndromes and joint hypermobility such as Ehlers Danlos syndrome. He is author of   Faint, Foggy, Fatigued & Adrenaline. It’s not in Your Head.