He works mainly on contract theory, competition policy, regulation, privatisation and industrial organisation. Current research interests include a contract theoretic study of the UK private finance initiative, annalysis of competitive planned obsolescence, asset values in regulation, access pricing in the presence of competition and the role of competition policy in regulated industries. Publications include articles in Econometrica, Review of Economic Studies, Journal of Public Economics and the Journal of Economic Theory. Ian Jewitt chairs the department's research committee. His research is broadly based in microeconomic theory but especially information economics and contract theory.
Current research includes work on information and incentives in organisation.
He was editor of the Review of Economic Studies and is now chair of the editorial board, and an associate editor of Economica. He is a member of the Centre for Market and Public Organisation and a research fellow of the Centre for Economic Policy Research. Publications include articles in Econometrica, Journal of Public Economics, Journal of Mathematical Economics, Review of Economic Studies. She was Senior Economic Adviser to the Department of Health on the Internal Market 1993-4. She is a member of the ESRC Research Grants Board, Chair of the Royal Economics Society Committee on Women and an RES Committee Member.