Dr Caulfield also a member of a number of National and International research groups and is the former Chair of the Irish Transportation Research Network and was a member of the executive committee of the Universities Transport Studies Group as well as several committees at the Transportation Research Board in Washington D.C.

He is a Senior Editor of Renewable & Sustainable Energy Reviews (impact factor: 14.982) and an Editor of Transport Policy (impact factor: 4.674). He is a member of the International Editorial Board of Transportation Research Part D: Transport and Environment (impact factor: 5.495), Case Studies on Transport Policy (impact factor: 1.038), and the Journal of Transport Geography (impact factor: 4.986).