Dato' Dr. Nik Ritza Kosai Nik Mahmood is a leading General Surgeon specializing in Upper Gastrointestinal, Metabolic, and Bariatric Surgery. He was instrumental in establishing and heading the Upper GI, Metabolic, and Bariatric Surgical unit at Hospital Canselor Tuanku Muhriz (HCTM), a premier referral center in Malaysia for Upper GI Cancers and Obesity Disorder, having performed over 1500 bariatric surgeries. A key opinion leader, he holds significant leadership roles in national and international surgical societies and has an extensive publication record. His patient care philosophy emphasizes advanced, minimally invasive techniques for complex gastrointestinal and metabolic conditions.