Noah works in the Antitrust practice and splits his time between Washington, D.C. and Silicon Valley. He partners with clients to craft and execute global antitrust strategies while also representing them before US courts, the US Department of Justice, Federal Trade Commission, and the various states’ Attorney General offices.
Antitrust plaintiffs and enforcers are invoking the antitrust laws in increasingly novel ways in private litigation and government investigations. Noah provides creative and nimble strategies that are specific to his client’s business objectives, whether they are in high-stakes litigation or planning a transformative deal. He is singularly focused on understanding each client to provide practical, business-oriented solutions. 
Noah draws on his 25 years of experience with complex cross-border antitrust issues, with a focus on how the antitrust laws intersect with intellectual property. He has successfully defended and asserted antitrust claims in merger and non-merger investigations before the enforcement agencies, and in federal district court. 
Noah has enjoyed teaching on Antitrust and Innovation as an adjunct professor for antitrust at UC Berkeley School of Law.. He is a prolific author and speaker on a range of competition topics, and contributes to American Bar Association (ABA) publications and commentary. 


Representative matters

GlobalWafers lead counsel in the global antitrust defense of the USD5.3bn acquisition of Siltronic, involving regulatory authorities in Asia and Europe.

Leading appliance manufacturer, defending against monopolization complaint alleging abuse of IP rights by the Egyptian Competition Authority, and on all aspects of antitrust compliance.

Leading semiconductor manufacturer, cleared of antitrust allegations in multi-jurisdictional investigation involving U.S. federal and state enforcers, and also in the European Commission and China.

Hytera Communications, a leading radio manufacturer, representing in antitrust monopolization claims against Motorola Solutions in the Northern District of Illinois.

Published Work

  • Noah Brumfield and Nicholas Putz, Uptick in Antitrust Scrutiny of Board Relationships, Daily Journal (Nov. 2022).
  • Noah Brumfield and Nicholas Putz, Antitrust Considerations for ESG Initiatives, Informa Connect (May 2022).

Leadership Positions And Professional Affiliations

  • Volunteer, UCLA Alumni Scholarship Program
  • Member, American Bara Association
  • Adjunct Professor, UC Berkley School of Law
CrowdStrike, defended CrowdStrike against antitrust claim arising from cybersecurity industry standard-setting in the Northern District of California, and defended parallel investigation by the DOJ Antitrust Division.
Par Pharmaceuticals, negotiated and subsequently defended AndroGel patent settlement in the leading “reverse payment” case.


  • Shortlisted article for the Antitrust Writing Awards, Concurrences Review and George Washington University Law School Competition Law Center, 2021



Registered Foreign Lawyer, England and Wales, 2024

Admitted: State Bar of California, 1999

Admitted: District of Columbia Bar, 2004

US District Court for the District of Columbia

US District Court for the Central District of California

US District Court for the Eastern District of California

US District Court for the Northern District of California

US District Court for the Southern District of California

US Court of Appeals for the District of Columbia Circuit

US Court of Appeals for the First Circuit

US Court of Appeals for the Third Circuit

US Court of Appeals for the Fourth Circuit

US Court of Appeals for the Ninth Circuit

US Court of Appeals for the Eleventh Circuit


JD, Columbia University School of Law, 1999

BA, University of California, Los Angeles, 1995

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A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.