Certificates:
- Fellow of American College of Physicians (FACP),
1980
- Fellow of American College of Chest Physicians (FCCP),
1980
Fellowships:
- Research Fellow, Pulmonary Disease, McGill University, Montreal, Canada,
1975
- Pulmonary Disease, University of Cincinnati College of Medicine, Ohio, USA,
1974
Residencies:
- Internal Medicine, University of Cincinnati College of Medicine, Ohio, USA,
1971
Medical School:
- M.D., Faculty of Medicine, Siriraj Hospital, Mahidol University, Thailand, 
1967

Board Certifications:
- The American Board of Critical Care Medicine,
1995
- The American Board of Pulmonary Disease,
1976
- The American Board of Internal Medicine,
1972