​​Dr. Green attended the University of Rochester for undergraduate and the School of Medicine before completing his pulmonary fellowship at Boston University School of Medicine. He then started the pulmonary service at Emerson Hospital in Concord, Massachusetts where he has continued to practice. In 2000 The Chronic Lung Disease Program at Emerson Hospital's Home Care Department, which he founded and still directs, received the Nesson Award for Innovation from Partners Community Healthcare, Inc. The program dramatically reduced hospitalization and Emergency Department visits for patients with chronic lung disease. In 2006 he was awarded Clinician of the Year from the Massachusetts District Medical Society. In 2009 he attended Boston University as a Faculty Scholar in Geriatrics as a Hartford Foundation Fellow and in 2016 was awarded Physician of the Year by the Home Care Alliance of Massachusetts. Starting in 2013 Dr. Green has been working with Atrius Health focusing on patients needing home care or residing in skilled nursing facilities.
Dr. Green has been an early member of the Senscio team focusing on improving home care. He has been involved in creating the algorithms for patients with lung disease and in developing processes to deliver excellent home care.​