His work develops theories and models of multi-modal metropolitan passenger transport systems by combining advancements from behavioural sciences, operations research and complex network theory. His research focuses on system dynamics and uncertainty in route choice and assignment, service optimization, control, network design and robustness, travel information and reliability. He is a member of PTV Scientific Advisory Board on public transport modelling and member of several TRB committees. His research activities often support public transport agencies and operators decision making as part of the Smart Public Transport Lab.