Mark Popofsky

Mark Popofsky is Chair of the Antitrust Group at Ropes & Gray LLP and a nationally recognized authority on antitrust law. He has taught advanced antitrust courses as a Lecturer on Law at Harvard Law School, a Lecturer of Law at the University of Pennsylvania Carey Law School, and an Adjunct Professor at Georgetown University Law Center for more than two decades.

Previously, Popofsky served as Senior Counsel to Assistant Attorney General Joel Klein in the Antitrust Division of the U.S. Department of Justice, where he played a key trial role in United States v. Microsoft Corp. and argued United States v. Nippon Paper. He also served as a prosecutor in the U.S. Attorney’s Office for the Eastern District of Virginia. Recently, Popofsky has served as trial counsel for Google in United States v. Google and secured a landmark victory in the California Supreme Court in Ixchel Pharma, LLC v. Biogen Inc.

Popofsky’s scholarship focuses on exclusionary conduct and the intersection of antitrust and intellectual property, and his widely cited writings include Defining Exclusionary Conduct (Antitrust L.J. 2006) and The Sherman Act’s Criminal Extraterritoriality (Competition Policy Int’l 2011), the latter of which earned the Burton Award for legal achievement. He clerked for Judge Dorothy W. Nelson on the U.S. Court of Appeals for the Ninth Circuit and is a graduate of Harvard Law School and Brown University.