J. Gregory Sidak is the Chairman of Criterion Economics, which he founded in 1999. He has testified as an expert economic witness in complex business disputes throughout the world, and he twice served as Judge Richard Posner’s court-appointed neutral economic expert. Sidak co-founded the Journal of Competition Law & Economics, published quarterly by the Oxford University Press since 2005, and is also the publisher and editor of the Criterion Journal on Innovation, which he founded in 2016. He has held the Ronald Coase Professorship of Law and Economics at Tilburg University in The Netherlands and the F.K. Weyerhaeuser Chair in Law and Economics at the American Enterprise Institute for Public Policy Research. He has been a senior lecturer at the Yale School of Management and a visiting professor at Georgetown University Law Center. Sidak was Judge Posner’s first law clerk, served on the senior staff of the Council of Economic Advisers in the Executive Office of the President, and was deputy general counsel of the Federal Communications Commission. He has published six books and approximately 150 scholarly articles, primarily on antitrust, telecommunications regulation, and intellectual property.