Michael L. Weiner


Michael L. Weiner


New York | Three Bryant Park, 1095 Avenue of the Americas, New York, NY, United States of America 10036-6797
+1 212 698 3608 | +1 212 698 3599


Michael L. Weiner, co-leader of Dechert’s antitrust/competition practice group, provides strategic advice, resolves government investigations and effectively litigates for clients with antitrust issues in a broad range of industries.

Mr. Weiner has significant experience in successfully completing complex merger transactions, having represented Fresenius Medical Care in its $2 billion acquisition of NxStage Medical Inc., SK hynix on its role in the acquisition of Toshiba’s NAND (flash memory) business, American Express Global Business Travel in its acquisition of Hogg Robinson Group, Shanghai Shenda on its agreement to form a global joint venture with International Automotive Components, Yahoo!, Inc. in its joint venture with Microsoft, Inc., Avis in its acquisition of Budget, Genzyme in its acquisition of Ilex Oncology, Centennial Communications in its acquisition by AT&T, and Rural Cellular in its acquisition by Verizon Wireless.

Mr. Weiner is also one of the authors of the Dechert Antitrust Merger Investigation Timing Tracker (DAMITT), which is the leading source of analysis for significant U.S. and EU antitrust merger investigation and litigation trends.

In his litigation work, Mr. Weiner has represented clients in price fixing and other antitrust class actions in a variety of industries, including insurance (AXIS Specialty Insurance Company and AXIS Surplus Insurance Company), real estate brokerage (Realogy Corp.), art auctions (Christie’s, Inc.) and magnesite (China Minmetals Corporation and China National Minerals Co., Ltd). He represented Travelport Inc. in a high-profile, bet-the-company monopolization and antitrust conspiracy lawsuit with American Airlines.

Mr. Weiner is known as an innovator in his field and is recognized for his extensive knowledge of the industries he serves. Chambers USA notes he was “praised by commentators who note that ‘he is extremely knowledgeable on substantive antitrust law, and better yet, he’s easy to work with.’” Chambers USA also wrote that Mr. Weiner has won “particular acclaim” for his “M&A expertise” and is also noted for providing “thoughtful guidance” by commenters who consider him “extremely knowledgeable” and “extremely practical.” He has been named a national and New York “litigation star” in Benchmark Litigation, “recommended” in Legal 500, and listed in Chambers Global, Who’s Who LegalInternational Who’s Who of Competition Lawyers and Global Counsel Handbooks’ Competition Law, as well as in The Best Lawyers in America. He was also featured (a number of years ago) in Global Competition Review’s “45 Under 45 Survey of International Competition Lawyers.”

He is a past Chair of the New York State Bar Association’s Antitrust Section, where he currently serves on the Executive Committee. Mr. Weiner was an Officer and Council Member of the ABA’s Antitrust Section, and served as the Editorial Chair of ANTITRUST Magazine.  He also sits on the editorial board of World Competition Law and Economics Review and is a frequent speaker and author on a wide range of antitrust/competition issues.

  • University of Pennsylvania, B.A., 1976, cum laude
  • Georgetown University Law Center, J.D., 1980, magna cum laude
  • New York
  • New York State Bar Association Antitrust Section Chair (2017) and Executive Committee member (2003 - present)
  • ABA Antitrust Section Secretary and Chief Communications Officer (2002) and Council Member (1998 - 2001)
  • ABA Antitrust Section Antitrust Magazine Editor-in-Chief (1994 - 1998)
Speaking Engagements
  • Predicting the Future: U.S. M&A Consideration of Future Competitiveness of Merging Parties— New York State Bar Association, Virtual Presentation (July 16, 2020)
  • 2019 Annual Antitrust Spring Seminar — Dechert LLP, Philadelphia, PA (March 26, 2019)
  • DAMITT Webinar  — Dechert LLP, Digital (January 24, 2019)
  • Antitrust Law Section Annual Meeting — New York State Bar Association, New York, NY (January 17, 2019)
  • 6th Annual Global Merger Control Conference — Paris, France (November 30, 2018)
  • Minimizing Anticompetitive Risk in Asset and Stock Transfers - Wilmington, DE (June 1, 2017)
  • Strategically Fixing a Merger — ABA Section of Antitrust Law Spring Meeting 2017, Washington, D.C. (March 30, 2017)
  • President Trump's Potential Impact on Business — ACC GNY Signature CLE Program, New York, NY (March 21, 2017)
  • Antitrust Law Section Annual Meeting — New York State Bar Association, New York, NY (January 26, 2017)
  • Markets, Remedies and Survival: Cutting Edge Issues in Global Merger Control — 4th Annual Global Merger Control Conference, Paris, France (December 2, 2016)
  • The Global Antitrust Economics Conference — Concurrences + Searle Center on Law, Regulation, and Economic Growth at Northwestern Pritzker School of Law,Chicago, IL (October 7, 2016)
  • Conflict and Comity in International Cartel Enforcement - Cutting Edge Issues — New York State Bar Antitrust Law Section Annual Meeting, New York, NY (January 29, 2015)
  • Keeping Your Organization Compliant in a Confusing and Dangerous Antitrust Environment – Best Practices — 2014 US Corporate Counsel & Compliance Exchange, Palm Springs, CA (February 8, 2014)
  • Antitrust Limits — Next Generation of Antitrust Scholars Conference, New York, NY (January 17, 2014)
  • 9th Corporate Counsel Exchange — IQPC, Noordwijk aan Zee, The Netherlands (October 22, 2013)
  • Key Issues in Litigation Management: Practical Advice From When the Complaint Hits Your Desk Through Settlement or Trial — Presented by ACC GNY with sponsorship by Dechert LLP, New York, NY (September 26, 2013)
  • Managing Antitrust Risk and Staying Compliant in an Evolving Antitrust Landscape — Presented by ACC GNY with sponsorship by Dechert LLP, New York, NY (June 12, 2013)
  • Unilateral Effects: Not Just for Differentiated Products Anymore? — NERA Economic Consulting Seminar, New York, NY (June 5, 2013)
  • 8th Corporate Counsel & Compliance Exchange 2013 — IQPC, London (April 23, 2013)
  • Antitrust Developments: An Ounce of Prevention Is Worth a Pound of Cure — Association of Corporate Counsel, Greater New York Chapter, New York, NY (January 29, 2013)