The Public Service Division (PSD) has announced that Professor Tan Chorh Chuan, who has served over four decades in public service, will retire on Sept 1.This is among two other announcements relating to permanent secretary appointments announced on Thursday (July 30).Prof Tan, 67, is currently Permanent Secretary of National Research and Development (NRD), and Public Sector Science and Technology and Plans Office (S&TPPO) in the Prime Minister's Office.He graduated from the National University of Singapore (NUS) in 1983 and began his medical career as a renal physician, later taking on concurrent hospital and academic roles at NUS and the National University Hospital (NUH).Between 1997 to 1998, Prof Tan led the Department of Medicine at both NUS and NUH.In 2000, he was appointed as director of medical services at the Ministry of Health, playing an instrumental role in leading Singapore's public health response to the 2003 Sars epidemic. He was later appointed deputy chairman at the Agency for Science, Technology and Research (A*STAR) from 2004 to 2017, and as NUS's president between 2008 and 2017. Read more