His scholarship focuses on competition issues in technology markets. His articles have appeared in the University of Pennsylvania Law Review, Washington University Law Review, Vanderbilt Law Review, Maryland Law Review, and the George Washington Law Review. His commentary on contemporary antitrust topics has been featured by a variety of popular media outlets, including CNBC, the New York Times, and more. He is also engaged in advising a number of clients as a consulting expert regarding antitrust litigation and agency reviews. Prior to joining academia, John practiced as a trial attorney with the U.S. Department of Justice Antitrust Division.