Hart is currently the Lewis P. and Linda L. Geyser University Professor at Harvard University, where he has taught since 1993. He is the 2016 co-recipient of the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel, a Fellow of the Econometric Society, the American Academy of Arts and Sciences, the British Academy, and the American Finance Association, a member of the National Academy of Sciences, a Distinguished Fellow of the American Economic Association, and has several honorary degrees. Hart works mainly on contract theory, the theory of the firm, corporate finance, and law and economics. His research centers on the roles that ownership structure and contractual arrangements play in the governance and boundaries of corporations. He has published a book (Firms, Contracts, and Financial Structure, Oxford University Press, 1995) and numerous journal articles. He has used his theoretical work on firms and contracts in several legal cases. He has been president of the American Law and Economics Association and a vice president of the American Economic Association.