Jong-Yil Chai is Emeritus Professor in the Department of Tropical Medicine and Parasitology, Seoul National University College of Medicine, Seoul, Korea. Professor Chai has been investigating diseases caused by intestinal parasites, including flukes, roundworms, and protozoans, for more than 40 years in the Republic of Korea. He has also worked in other Asian countries, including China, Thailand, Lao PDR, Cambodia, Vietnam, Myanmar, and Indonesia, as well as in Africa, especially Tanzania. He has published ten books and more than 560 original research papers on parasitology. Professor Chai has served as editor of the Korean Journal of Parasitology since 2006. He has been President of the World Federation of Parasitologists since 2018 and Treasurer of the International Federation for Tropical Medicine since 2012. In addition, he has served as President of the Korea Association of Health Promotion since January 2016.