he is an adult endocrinologist and professor of medicine, physiology and biophysics and director of the bone health care clinic and the heliotherapy, light, and skin research center at boston university medical center, providing extensive evaluation and treatment programs for children and adults with various metabolic bone diseases including osteoporosis, osteomalacia, stress fractures in young athletic women and men, and minimum trauma and nontraumatic fractures in infants, children and adults with hypermobility syndromes, osteogenesis imperfecta, and ehlers danlos syndrome. he has been director of the general clinical research unit at boston university for several years.