Tai-Hyun Yoon is an experimental optical physicist focused on laser spectroscopy and frequency metrology. He obtained his B.S. (1985) in physics from Korea University and Ph.D. degree (1999) in quantum optics from KAIST. Before coming to Korea University, he was a principle investigator at the Korea Research Institute of Standards and Science (KRISS), and a research associate in the JILA laboratory at the University of Colorado.