Asst Prof Vivian Siu is a Senior Consultant in the Department of Emergency Medicine at Tan Tock Seng Hospital (TTSH), with a special clinical interest in geriatric emergency medicine. In addition to her clinical responsibilities, she contributes actively to medical education.

Asst Prof Siu serves as core faculty for the NHG Emergency Medicine Residency Programme and holds appointments as an Assistant Professor (Asst Prof) with the Lee Kong Chian School of Medicine and as a Clinical Assistant Professor with the NUS Yong Loo Lin School of Medicine.