Mayer Brown has a long history of representing clients in high-profile congressional investigations. Congressional investigations are subject to different constitutional, statutory, and procedural rules than other government investigations, and successful responses require advisers who can handle both the “congressional” and the “investigations” aspects. Our team has unparalleled legal and political acumen to guide clients through the most challenging investigations, gained over decades of experience handling congressional investigations from every angle – as senior committee staff conducting investigations, as legal counsel to House committees advising on subpoena issuance and enforcement, as senior congressional leadership staff tasked with overseeing investigations across congressional committees, as federal agency and White House staff handling congressional inquiries, as litigation counsel in congressional subpoena disputes, and as in-house counsel coordinating responses to congressional inquiries.



  • House: Energy & Commerce, Education & Workforce, Ethics, Financial Services, Foreign Affairs, Homeland Security, Judiciary Committee, Oversight & Accountability, Permanent Select Committee on Intelligence, Select Subcommittee on the Coronavirus Pandemic, Select Committee on January 6th Attack, Small Business, Ways & Means
  • Senate: Banking, Budget, Commerce, Finance, Health, Education, Labor, and Pensions, Homeland Security and Governmental Affairs, Judiciary, Permanent Select Committee on Investigations, Select Committee on Intelligence


  • Numerous global and domestic financial institutions, including preparing CEOs for testimony
  • Private equity companies
  • Global technology companies
  • Asset managers
  • Global insurers
  • Digital assets and crypto companies and trade associations
  • Housing and mortgage industry clients
  • Financial trade associations
  • Entertainment providers
  • Social media companies
  • Consumer goods manufacturers
  • Automakers
  • Industrial manufacturers
  • Defense and government contractors
  • High-ranking government officials

Key areas

  • Financial industry
  • Money laundering
  • Offshore taxation
  • ESG issues
  • Data privacy
  • Cybersecurity breaches
  • Private equity business practices
  • Climate change
  • Antitrust and corporate mergers
  • Digital assets
  • Housing markets
  • Product defects
  • Social media
  • National security/elections
  • Sanctions

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