Jeff Willoughby, M.D. is a full service pulmonary medicine and sleep medicine practice. Our doctor is certified to evaluate, diagnose, and treat disorders of the lungs and sleep. Dr. Willoughby specializes in the diagnosis and treatment of pulmonary (lung) conditions and diseases, such as COPD, asthma, emphysema, chronic bronchitis, interstitial lung disease, lung cancer, and a wide spectrum of pneumonias and other inflammatory diseases.