Before joining Hanyang University, he was a research fellow in the department of transportation systems research in the Seoul Institute, the think tank of Seoul Metropolitan Government, Korea. In the institute, he actively conducted various transportation studies, including public transportation, green car deployment plans and congestion mitigation strategies. He has served on various committees charged with the assessment of traffic and environmental impacts from transportation projects. He earned his Ph.D. in transportation systems engineering from the Georgia Institute of Technology, USA.