Kyungsik Choi is a professor at the School of Earth and Environmental Sciences at Seoul National University in Korea. He has been a member of SEPM since 1991 and has served the society as a Global SEPM Ambassador since 2014. He is also a member of IAS, AGU, EGU, and AAPG. Kyungsik received B.Sc., M.Sc., and Ph.D. degrees in marine geology and sedimentology from Seoul National University. After conducting postdoctoral research at Queen's University in Canada, he joined Korea National Oil Corporation, where he worked for two years conducting geological characterization of heterlithic siliciclastic reservoirs in Iraq, Vietnam, Kazakhstan, and Canada. Kyungsik returned to academia in 2007, taking a tenure-track position at Chonnam National University (2007-2012) before moving to Seoul National University, where he has been a faculty member since 2012. 

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Kyungsik's research focuses on rivers and marginal marine depositional systems such as estuaries and deltas, spanning from tropical to Arctic regions. His research interests lie in predicting tide-dominated sedimentary facies and architecture over time and space by combining modern observations and outcrop measurements. He employs an interdisiplinary approach using innovative tools such as high-precision GPS surveys, UAV-based photogrammetry, and in-situ current and wave measurements, alongside conventional core and outcrop analysis. His current field campaigns in Myanmar, Svalbard, Utah, and Korea highlight the tidal backwater effect on channel morphodynamics and bar architecture in the fluvial-marine transition zone. Kyungsik published 54 peer-reviewed scientific papers in various international journals and authored a book on the tide-dominated Han River delta.