Alan S. Chanales, MD, FACP, is a pulmonologist and critical care medicine specialist who diagnoses and treats patients at his office at 15225 Shady Grove Road, Rockville, Maryland. Dr. Chanales has 37 years of expertise in the field and specializes in asthma and COPD. Dr. Chanales attributes his success to spending time to carefully listen to his patients so that he is able to fully understand the nature of their problems.