Sangjoon Bak is a Ph.D. student in Biological and Agricultural Engineering at the University of California, Davis. He graduated with B.S. and M.S. degrees in the Department of Regional Infrastructure Engineering at Kangwon National University, Korea. His research interests include hydrology, groundwater–surface water interactions, hydrologic modeling, and application of machine learning for agricultural water management. His current research focuses on developing a scalable Digital Twin for water accounting to advance sustainable water management.