Gregory J Tsay is professor of School of Medicine and director, Immunology Research and Development Center, China Medical University Hospital, Taichung, Taiwan. He graduated from Medical School of Chung Shan Medical with M.D. and earned Ph.D. Following a one-year research fellow at Royal North Shore hospital, Sydney, Australia (under the supervision of Dr. David Nelson) and a two-year research fellow at The Scripps Research Institute, La Jolla, USA (under the supervision of Dr. Eng M Tan), He returned to Taiwan to head the division of Rheumatology and Immunology, Chung Shan Medical University Hospital, Taichung, Taiwan. He was appointed as an assistant professor, associated professor, and then full professor in 1990. His main fields of scientific interest are in autoimmune diseases. He is vice-president of Federation of Immunological Society of Asia- Oceania (FIMSA 2015-) and He was president of Taiwan Immunology Society and Taiwan Rheumatolgy Society, and Secretary General of FIMSA.

His main fieldds of scientific interest are in autoimmune diseases.