Dr. Kwang-Sub Lee received his PhD degree in Transportation Engineering in 2009 from Virginia Tech in the USA. During his PhD, he was heavily involved in TRANSIMS activity-based models. After his PhD, he worked at Michael Baker, Corp., in Maryland in the USA as a Planning Associate. Since 2011, he has been working at KRRI (Korea Railroad Research Institute) as a senior researcher. His research interests include urban and transportation planning, activity-based modeling, big data analysis, land-use and public transportation planning, travel demand forecasting, and travel behavior analysis.