Prof. Yoo Hyun Um is currently working as an assistant professor in the Department of Psychiatry at St.Vincent’s Hospital, College of Medicine, Catholic University of Korea. She has been working as a member of the board member of Korean Assoication for Geriatric Psychiatry and is an associate editor for psychiatry investigation. She is an international sleep specialist certified by the World Sleep Society. Her research interests include linking sleep and dementia research, Alzheimer's disease, geriatric sleep, sleep disorders, and geriatric psychiatry.