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Aaron S. Dyer

Partner at Pillsbury Winthrop Shaw Pittman LLP

Aaron S. Dyer's profile photo
LocationLos AngelesCalifornia, United States
Current rolePartnerPillsbury Winthrop Shaw Pittman LLP · since Feb 2026
Government service6yrsCourt of Appeals for the Ninth Circuit · U.S. Attorney’s Office

About

Aaron Dyer, Pillsbury’s Corporate Investigations & White Collar Defense Practice Group Co-Leader, is a former federal prosecutor and experienced trial attorney whose practice focuses on complex criminal and civil litigation and regulatory enforcement actions. 

In addition, Aaron represents individuals and corporations in internal investigations and intellectual property litigation, with an emphasis on securities, health care, the False Claims Act, and intellectual property theft and piracy. He also advises clients on corporate governance issues and the implementation of corporate compliance programs.

Aaron spent almost seven years as a federal prosecutor in the U.S. Attorney’s Office in Los Angeles. While in the criminal division of the U.S. Attorney’s Office for the Central District of California, he tried numerous complex fraud cases, including securities, bank, tax, investment and insurance fraud. In addition, he spearheaded the Internet and computer crime prosecutions for the U.S. Attorney’s Office, serving as the Computer and Telecommunications Crimes Coordinator. He also served as the acting chief and deputy chief of the Major Frauds Section. During that time, he handled numerous oral arguments in the Ninth Circuit. His significant cases included:

  • The mail fraud and money laundering prosecution of M. Elizabeth Broderick, a.k.a. the “Lien Queen,” who was the leader of the Southern California faction of the Montana Freemen militia

  • The securities/investment fraud prosecution of Stephen Murphy, author of One Up On Trump and other real estate investment books

  • The insurance fraud prosecution of Irwin Bransky, CEO of the nation’s then-largest computer software wholesaler

  • The securities and investment fraud prosecution of the top executives of Ocean’s Best Seafood

  • A nationwide sweep of individuals and companies engaged in piracy of DirecTV satellite television

As a result of his government experience and his other representations, Aaron is uniquely equipped to represent clients facing litigation or regulatory issues. His extensive trial and appellate experience ensures that litigation will be handled aggressively, efficiently and effectively. His working knowledge of grand jury proceedings and other criminal and civil investigations allows him to navigate and explain those difficult and uncertain waters. His experience as a prosecutor evaluating compliance programs, and as a defense attorney advocating the attributes of his clients’ compliance programs in negotiations with prosecutors and regulators, allows him to provide clients needing to implement or update their compliance program or codes of conduct with rare insight into current corporate governance requirements. His experience working with the federal law enforcement agencies allows him to offer his clients who have been harmed alternatives to purely traditional litigation, alternatives that have allowed his clients to obtain relief that far exceeded what they could have obtained through the civil process.

Roles

Feb 2026–Present
Current role

Partner

Pillsbury Winthrop Shaw Pittman LLP

Los Angeles, California

AttorneyCivil LitigationAttorney AdvisorIntellectual Property AttorneyCompliance

Aaron represents individuals and corporations in internal investigations and intellectual property litigation, with an emphasis on securities, health care, the False Claims Act, and intellectual property theft and piracy. He also advises clients on corporate governance issues and the implementation of corporate compliance programs.

Feb 2000–Feb 2004
Former role

Senior Counsel

O'Melveny & Myers LLP

Los Angeles, California

AttorneyCivil LitigationResearchInvestigationsLegal
May 1996–Apr 2000
Former role

Acting Chief and Deputy Chief

Court of Appeals for the Ninth Circuit, Major Frauds Section

(appointed)California

AttorneyInvestigationsGovernmentProsecutorCriminal Investigation

Aaron handled numerous oral arguments in the Ninth Circuit. His significant cases included:

  • The mail fraud and money laundering prosecution of M. Elizabeth Broderick, a.k.a. the “Lien Queen,” who was the leader of the Southern California faction of the Montana Freemen militia

  • The securities/investment fraud prosecution of Stephen Murphy, author of One Up On Trump and other real estate investment books

  • The insurance fraud prosecution of Irwin Bransky, CEO of the nation’s then-largest computer software wholesaler

  • The securities and investment fraud prosecution of the top executives of Ocean’s Best Seafood

  • A nationwide sweep of individuals and companies engaged in piracy of DirecTV satellite television

Feb 1994–Feb 2000
Former role

Assistant United States Attorney

U.S. Attorney’s Office, Criminal Division

(appointed)California Central District

AttorneyFederal GovernmentSecuritiesLegalTax LawComputer Engineering

Aaron spent almost seven years as a federal prosecutor in the U.S. Attorney’s Office in Los Angeles. While in the criminal division of the U.S. Attorney’s Office for the Central District of California, he tried numerous complex fraud cases, including securities, bank, tax, investment and insurance fraud. In addition, he spearheaded the Internet and computer crime prosecutions for the U.S. Attorney’s Office, serving as the Computer and Telecommunications Crimes Coordinator.

Feb 1992–Mar 1994
Former role

Associate

Skadden, Arps, Slate, Meagher & Flom LLP and Affiliates

Los Angeles, California

Civil LitigationResearchLegal AssistantInvestigations

Representative matters

Experience

February 2026

-Represented publicly held companies and their officers and directors in complex securities litigation, internal investigations and regulatory matters. -Defended a satellite television security provider in a federal criminal investigation—including successfully convincing the government to decline to file charges. -Obtained complete dismissal of all charges against an executive in criminal proceedings involving alleged violations of the Clean Air Act. -Defended an Office of the Special Inspector General for the Troubled Asset Relief Program (SIGTARP) investigation into a government contract for mining activities in Afghanistan. -Led several internal investigations for a major health care technology company. -Represented various companies in auto-renewal law (ARL) district attorney task force enforcement actions and private class actions. -Defended an executive of a publicly traded company in the NASCAR industry on charges of insider trading—including eventually convincing the SEC to decline to file charges. -Defended a professional athlete in criminal and civil proceedings—including successfully obtaining dismissal of both criminal and civil charges on grounds of mistaken identity. -Defended a former executive of Enron Corporation in a federal criminal prosecution in Texas. -Defended an aerospace laboratory in a toxic tort class action. -Defended a chemical manufacturer in a toxic tort class action. -Represented a major semiconductor manufacturer of computer chips regarding theft of its trade secrets. -Represented a money transmittal company in recovering funds fraudulently stolen and laundered in overseas banks, in licensing proceedings, and in litigation regarding poaching of its sales agents. -Represented multiple money transmittal/money services businesses in government investigations and on anti-money laundering compliance issues. -Represented a major entertainment trade association on anti-piracy issues. -Defended Mantra Entertainment and its CEO in federal and state criminal, tax and civil proceedings. -Represented financial institutions in government investigations.

False Claims Act Matters

February 2026

-Representing a government contractor in a civil False Claims Act investigation and litigation involving allegations by a former employee that the company and a subcontractor defrauded the federal government while performing a $60 million munitions clearing contract in Iraq. -Representation of a relator in a civil False Claims Act case against a government contractor alleging that the contractor falsely represented that it was a Woman-Owned Small Business, in seeking contracts from the government and other prime contractors. -Obtained dismissal of False Claims Act civil complaint filed by an anonymous relator against a student-loan collections company claiming tens of millions in damages. -Defended an integrated health care delivery system in a civil and criminal False Claims action related to hospital Medicare billing. -Defended a pharmaceutical manufacturer in a civil False Claims action related to pricing. -Defended a major military aircraft manufacturer in a civil False Claims action. -Defended a hospital CEO in a criminal and civil False Claims Act investigation related to marketing. -Defended a major office furniture manufacturer in a civil False Claims action related to pricing. -Defended a building materials supplier in a civil False Claims case related to antitrust issues. -Defended a city and port in a civil False Claims action.

Recognition

Honors

America’s Best-in-State Lawyers for California

Forbes

California | May 2025

Recognized in Forbes’ inaugural list of America’s Best-in-State Lawyers for California (2025)

500 Leading Litigators in America

Lawdragon

June 2023

Recognized by Lawdragon as one of 500 Leading Litigators in America (2023)

Litigation: White-Collar Crime & Government Investigations

Chambers USA

April 2025

Recognized by Chambers USA for Litigation: White-Collar Crime & Government Investigations (2022–2025)

Criminal Defense: White-Collar

Best Lawyers (published by BL Rankings LLC)

February 2026

(2013 – 2026)

Criminal Defense: General Practice

Best Lawyers (published by BL Rankings LLC)

February 2026

(2018–2026)

Publications & speeches

Pillsbury’s Fintech, Payments & Blockchain Practice Earns First National Chambers Ranking

pillsburylaw.com

December 2022

Marking its first national ranking in the Chambers FinTech Guide, Pillsbury’s Fintech, Payments & Blockchain practice was recognized for the group’s commitment to advising clients on regulatory compliance, corporate and transactional work and licensing. Identifying one of the practices’ many successful fintech matters in 2022, Chambers highlighted the firm’s representation of Larva Labs in the sale of the intellectual property of the CryptoPunks and Meebits Non-Fungible Token (NFT) collections to Yuga Labs (a transaction led by partners Ed Cavazos, Ron Fleming and Ted Powers).

Link

Pillsbury Earns High Marks in 2018 The Legal 500 United States

pillsburylaw.com

June 2018

Pillsbury earned a total of 29 practice rankings and 103 individual lawyer recognitions in the 2018 edition of The Legal 500 United States. In addition, six lawyers were recognized as “Leading Lawyers,” the top ranking given to an individual. These were: James Alberg and Aaron Oser (Outsourcing); John Heisse (Construction); Mark Lessard (Asset Finance & Leasing); Susan Serota (Employee Benefits & Executive Compensation); and Christopher Wall (International Trade). Meighan O’Reardon and James McPhillips were recognized as “Next Generation Lawyers” in Outsourcing.

Link

Fraud, Suspension & Debarment, False Claims Act and the ’Parade of Horribles

Pillsbury’s 2023 West Coast Government Contracts Summit — San Diego

April 2023

Join the Club: The Clear and Conspicuous Risk of California’s Auto-Renewal Statutes

2021 Wine Beer and Spirits Law Conference

October 2021

Collusion, Bribery and Fraud, Oh My! Does Your Ethics & Compliance Program Protect You from Increased Coordination and Scrutiny by the DOJ, Investigators, and Government Customers?

Pillsbury Winthrop Shaw Pittman CLE Marathon — San Diego

Battling the Government Hydra: A Coordinated Approach to Defending Parallel or Eventual Criminal, Debarment, Civil and Contractual Enforcement Proceedings

Pillsbury’s 5thAnnual West Coast Government Contracts Summit

May 2019

Presenter

Never Hearing ‘I Told You So’ – Best Practices for Preparing and Responding to a Federal Investigation

17thAnnual Compliance & Ethics Institute — Las Vegas

October 2018

Speaker