Professor Caulfield is Head of Discipline in the Department of Civil, Structural and Environmental Engineering. His research addresses global issues such as the environmental impacts of transport and methods to reduce the carbon impacts of transport.
Professor Caulfield has published over 200 papers in international journals and conferences. He currently has 9 PhD students and 6 postdoctoral researchers in his research group.
He is a Senior Editor of Renewable & Sustainable Energy Reviews and an Editor of Transport Policy. He is a member of the International Editorial Board of Transportation Research Part D: Transport and Environment, Case Studies on Transport Policy, the Journal of Cycling and Micro-mobility Research, and the Journal of Transport Geography.