- 1977-1993 Internist at Mc-Cormick Hospital, Chiangmai, Thailand
- 1988 Visiting Physician at Trinity Lutheran Hospital, Kansas City,Missourie, USA. (Pulmonary Division)
- 1989-1993 Part Time Teaching Staff for Faculty of Nursing, Payap University,Chiangmai
- 1993-present Internist (Pulmonary Medicine), Chiangmai Ram Hospital