Chief Physician, Professor, and Doctoral Supervisor. Specializes in the diagnosis and treatment of difficult and rare diseases of the respiratory system. Has accumulated rich clinical experience particularly in eosinophilic lung diseases, pulmonary vasculitis, pulmonary embolism, severe refractory asthma, lung involvement of connective tissue diseases, lung infections, and interstitial lung diseases. Served successively as Resident, Chief Resident, Attending Physician, Associate Chief Physician, and Chief Physician at Peking Union Medical College Hospital. Completed a 1-year visiting scholarship at the Mayo Clinic.