Ruengdej Mangkorndejsakul has been working as a Director of Strategy and Planning Division at the Department of Rail Transport (DRT), Ministry of Transport (MOT), Thailand, since 2021. He is responsible for the development of railway transport projects. He has a BE in civil engineering from Thammasat University and a MBA in Finance from the same university, graduating in 2005. His area of interest is the development of public transport in Bangkok Metropolitan region and Railway development plan and investment. His current work involves analyzing MOT’s railway projects according to the Railway and Mass Rapid Transit Master Plan.