1. Professor of Anesthesiology.
2. Associate Attending Anesthesiologist.
3. Research Assistant, Departments of Anesthesiology and Critical Care Medicine.
4. Attending Orthopaedic Surgeon.
5. Associate Professor of Statistics, the School of Original Investigations and Social Sciences, Singapore Management University, Singapore.
6. Professor of Orthopaedic Surgery, Chief, Orthopaedic Surgery Service, Memorial Sloan-Kettering Cancer Center, Weill Medical College of Cornell University, New York.