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About Heather Lamberg

Heather is a partner in our antitrust, competition and trade practice, based in Washington, DC who specializes in antitrust litigation, and has spent the last 20+ years helping her clients successfully navigate complex antitrust matters pending in state and federal courts, as well as enforcement actions before the US Department of Justice (DOJ), the Federal Trade Commission (FTC), and state attorneys general.

Heather prides herself in being a creative litigator with a long history of getting antitrust cases dismissed at early stages for her clients, defeating class certification in a large multi-district litigation case, as well as trying antitrust cases before both judges and juries.  Her experience spans a wide variety of claims – from conspiracy claims of market allocation or price-fixing, to monopolization claims of exclusive dealing, bundling, tying to and unfair competition claims. 

In addition to litigation, Heather defends companies and individuals in criminal price-fixing (cartel) investigations before the DOJ and worldwide regulators, including being involved most of the large, global cartel investigations over the past two decades.

Heather is consistently recognized for her work by leading industry publications including The Legal 500, Global Competition Review, The Best Lawyers in America, Benchmark Litigation, and Who’s Who Legal.

Recent work

Heather’s experience includes defending:

  • Englewood Hospital in FTC v. Hackensack Meridian Health, FTC challenge to hospital merger
  • Pharmaceutical companies in In re General Pharma Antitrust Pricing Litigation alleging industry wide conspiracy to allocate customers and fix prices, as well as related DOJ investigations
  • Auto Part Supplier JTEKT in DOJ price fixing criminal investigations (and foreign regulators), and follow-on class action case that resulted defeat of class certification
  • Zillow in a case brought by an alleged competitor claiming predatory pricing, unfair competition and false advertising related to for-sale-by-owner postings
  • North American Soccer League in a lawsuit alleging that U.S. Soccer and Major League Soccer conspired to eliminate D1 and D2 men’s soccer competition
  • Covidien in trial alleging monopolization of sharps container medical device market through exclusive dealings and bundled pricing



  • J.D., Georgetown University, 1998
  • B.A., Macalester College, 1994


  • District of Columbia
  • Maryland
  • USCA - 6th Circuit 

Speaking Engagements

  • “Pay-for-delay Deals – On Borrowed Time?” GCR Live: Antitrust in Pharmaceuticals (December 2022) 
  • “Counsel for Plaintiffs and Defendants Discuss Settlement in the U.S.,” 11th International Cartel Workshop in Tokyo Japan (February 2016)
  • Antitrust Litigation Forum, Cambridge Forums (November 2015)
  • “Cartel Enforcement and Competition Law Developments in Brazil,” NYB Association, International Section Seasonal Meeting (November 2015)
  • “Cartel/criminal Updates for 2015,” ABA Criminal & Cartel Committee (November 2015)
  • “Don’t Get Caught Unawares: Lessons From the Antitrust Front Lines in Global Merger and Cartel Defense,” 4th Annual South Korea Outbound Symposium, with B. Buffier and G. Goeteyn (April 2015)
  • “Development of Foreign Clients,” NYB Association Women’s Panel & Networking Event (January 2015)
  • NERA Antitrust Conference (July 2014)
  • “How to Prepare in an Era of Aggressive Global Cartel Enforcement,” Japan Institute for Overseas Investment, with B. Buffier, S. Mavroghenis and M. Ikeda (December 2012)