Mark’s practice concentrates on U.S. and European antitrust law and includes civil and criminal litigation in U.S. federal and state courts, appearances before U.S. and non-U.S. antitrust regulatory agencies, and the analysis of competitive issues in mergers, acquisitions, and joint ventures. He spent fourteen years in the DOJ’s Antitrust Division, departing in 1986 as Deputy Assistant Attorney General. Mark has lectured at various universities in the U.S. and Europe, and has participated in numerous panel discussions on criminal and civil antitrust law.