Greg is Senior Economic Counsel in the Antitrust Division of the U.S. Department of Justice, where he has worked since 1977. Holding a Ph.D. in Economics from the University of Wisconsin, Greg has worked on a wide array of policy matters at the Antitrust Division, including enforcement guidelines relating to collaboration among competitors, intellectual property, international operations, and mergers. He assisted in the preparation of over fifty amicus briefs filed with the Supreme Court, and since 1985 worked on all appeals in Department of Justice civil antitrust cases. Greg has also authored more than a hundred scholarly publications on antitrust policy and related topics.