Dr Yoon was the President of Korea Polar Research Institute (KOPRI) and is a paleoceanographer. He has been participating in the Korean Polar Research Program since 1988 and also wintered twice at the King Sejong Station in Antarctica. Since 2004, he has been teaching graduate students in Korea at the University of Science and Technology as a Professor. For a number of years, he served as Committee member of SCAR and Board member of Geological Society of Korea. He is currently serving as a Committee member of ANDRILL and Vice President of Polar Technology Research Committee in Korea.