Stephen Medlock

Mayer Brown

Stephen M. Medlock is a partner in Mayer Brown’s Washington DC office. He focuses his practice on antitrust litigation and criminal investigations, with an emphasis on the overlap between antitrust and intellectual property law and high-technology markets.

He handles all substantive aspects of antitrust matters, including drafting dispositive motions, planning and executing discovery strategies, taking and defending depositions, working with expert witnesses, preparing witnesses to testify at trial and before grand juries, advocating before the US Department of Justice and Federal Trade Commission, and counseling clients concerning on-going antitrust risks. His depositions and briefs have been quoted in the Washington Post, the New York Times, The Atlantic, and the Baltimore Sun.

Antitrust-IP Litigation and Counseling. Stephen regularly represents clients in antitrust litigation that overlaps with the use and acquisition of intellectual property rights. These cases frequently involve claims that a dominant firm has denied a rival access to a portion of a proprietary system or that a company with a sizeable market share and strong intellectual property rights has engaged in monopolization.

Stephen has litigated for both plaintiffs and defendants in these antitrust-IP cases. In addition, Stephen often counsels companies on the antitrust risks associated with licensing or refusing to license patents.

Antitrust Litigation. Stephen’s representations have included some of the largest antitrust and unfair competition cases filed by private plaintiffs and the class action bar. These matters have included a variety of legal theories including price-fixing, monopolization, exclusive dealing, tying, Robinson-Patman Act violations, patent misuse, and business torts.

Recently, Stephen helped obtain summary judgment for Nestlé USA in In re Chocolate Confectionery Antitrust Litigation, one of the largest multi-district antitrust class actions to date. In 2015, Global Competition Review nominated In re Chocolate Confectionery Antitrust Litigation as “Litigation of the Year, Cartel Defense: Creative, Strategic, and Innovative Litigation on Behalf of a Defendant.”

Stephen regularly participates in the American Bar Association’s Section of Antitrust Law where he is a Vice Chair of the Exemptions & Immunities Committee and the co-editor of the forthcoming third edition of the Noerr-Pennington Doctrine treatise.

Education :

  • American University Washington College of Law, JD, cum laude
  • Georgetown University

Admissions :

  • District of Columbia
  • US Court of Appeals for the Third Circuit
  • US Court of Appeals for the Eighth Circuit
  • US District Court for the District of Columbia

Experience :

  • Masimo Corporation v. Philips Electronics North America Corporation, 2015 WL 2406155 (D. Del.). Represented Philips Electronics North America Corporation in connection with antitrust-IP claims for monopolization, attempted monopolization, conspiracy to monopolize, tying, group boycott, restraint of trade, and patent misuse.
  • tyntec Inc. v. Syniverse Technologies, LLC, 2017 WL 2733763 (M.D. Fla.). Representing tyntec Inc. and tyntec Group Ltd. in connection with antitrust claims for monopolization and attempted monopolization of the high-tech market for sending and hosting text and video message traffic.
  • In re Broiler Chicken Antitrust Litig. (N.D. Ill.). Representing Foster Farms, LLC against multiple class actions alleging that the major U.S. chicken companies conspired to restrict output and fix prices.
  • Massengale v. City of Jefferson, Missouri, 2011 WL 3320508 (W.D. Mo. 2011). Represented Republic Services and won summary judgment on all antitrust claims, including allegations that Republic Services violated Sections 1 and 2 of the Sherman Act.
  • Automotive Parts Antitrust Investigation. Represented multiple executives alleged to have conspired abroad to fix the prices of automotive parts destined for the US market.
  • In re Grand Jury Proceedings. Represented client in successful invocation of act of production privilege in response to grand jury subpoena issued by Public Integrity Section of the US Department of Justice.
  • Non-Public Antitrust Audit. Conducted internal investigation and enhanced antitrust compliance procedures for multi-billion dollar automotive parts company.


Rate : $$$

What types of cases Attorney Stephen Medlock & Mayer Brown can handle?
Mayer Brown can handle cases related to laws concerning Litigation, White Collar Crime, Antitrust & Trade, Intellectual Property. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Mayer Brown located?
Mayer Brown is located at 1999 K St NW, Washington, DC 20006, USA. You can reach out to Mayer Brown using their phone line 202-263-3221. You can also check their website or email them at [email protected].
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