Michael Mugmon

Michael Mugmon is a partner in WilmerHale's San Francisco office. He regularly conducts internal investigations into potential misconduct, defends clients facing significant government enforcement actions involving the US Attorney's Office, the US Securities and Exchange Commission, state attorney general's offices and the Financial Industry Regulatory Authority, and handles complex commercial and securities litigation in federal and state court. He has experience in matters related to financial fraud, breach of fiduciary duty, accounting irregularities, anti-money laundering, insider trading, the Foreign Corrupt Practices Act, compliance and risk management, internal controls, and disclosure issues.

Mr. Mugmon joined the firm's Washington DC office in 2003 and moved to the Palo Alto office in 2007 as a founding member of that office's government investigations and litigation practice. In 2019, he became a founding partner of the firm’s San Francisco office. Several years ago, Daily Journal named him one of California's top 20 lawyers under 40.

A graduate of the University of Pennsylvania Law School, Mr. Mugmon is the chair of the firm’s Northern California offices’ Hiring Committee, and he also serves on the firm's Pro Bono and Community Service Committee and Ethics Committee. 



  • Pro Bono and Community Service

    • Serving as a Lead Adjudicator for San Francisco Neighborhood Courts alternative dispute resolution program operated by San Francisco District Attorney's office
    • Achieved 35-year reduction in sentence for California inmate who received improper gang enhancement of indeterminate length to sentence for role as armed robbery getaway driver
    • Represented California gang member charged with RICO and VICAR conspiracy to commit murder in federal district court in Northern District of California
    • Represented California inmate in successful parole proceedings after California Board of Parole Hearings had denied his 15 previous applications
    • Secured U-VISA for Mexican immigrant who was victim of domestic abuse
  • Representative Matters

    • Represented consumer healthcare technology company Theranos Inc. in regulatory matters involving the US Attorney’s Office, the US Securities and Exchange Commission, and the Arizona Attorney General’s Office and in class action litigation arising out of alleged misrepresentations to investors, regulators and consumers
    • Represented Pacific Gas & Electric in connection with regulatory compliance efforts
    • Successfully resolved US Securities and Exchange Commission inquiry involving revenue recognition for cloud computing products on behalf of major international technology company by obtaining letter closing investigation without adverse action
    • Successfully resolved US Securities and Exchange Commission inquiry relating into initial public offering on behalf of major social media company by obtaining letter closing investigation without adverse action
    • Represented major Middle East-based company in responding to audit request and in enhancing compliance program, with focus on Foreign Corrupt Practices Act and export compliance
    • Representing California developer in public corruption inquiry by the US Attorney’s Office
    • Representing individual and investment management firm in US Securities and Exchange Commission inquiry involving investment in special purpose acquisition company that merged with a Middle East-based communications and surveillance company
    • Successfully resolved US Securities and Exchange Commission inquiry on behalf of individual investigated for potential insider trading by obtaining letter closing investigation without adverse action
    • Representing several San Francisco Bay Area public companies in securities class action litigation matters
    • Obtained dismissal of class action against major public semiconductor company concerning its acquisition of competitor in California state court
    • Conducted internal investigation on behalf of mobile payments and identity verification company into allegations of potential money laundering and violations of the anti-bribery provisions of the Foreign Corrupt Practices Act
    • Represented international investment bank/broker-dealer in California Attorney General inquiry involving underwriting of mortgage-backed securities
    • Represented audit committee of board of directors of California retail company in connection with potential suppression of insurance reserves and misconduct by company management


  • Named one of the "Top 20 Lawyers Under 40" in California by Daily Journal
  • Recognized as a “Super Lawyer” in the 2018–2019 editions of Northern California Super Lawyers (previously recognized as a “Rising Star” in the 2011–2017 editions)
  • Burton Award for Legal Achievement, 2011

Insights & News


  • Education

    • JD, University of Pennsylvania Law School, 2002

      cum laude Editor-in-Chief, University of Pennsylvania Law Review; Arthur Littleton and H. Clayton Louderback Legal Writing Instructor
    • BA, University of Pennsylvania, 1999

      magna cum laude Phi Beta Kappa
  • Admissions

    • California

    • District of Columbia

    • Maryland

  • Clerkships

    • The Hon. Ruggero J. Aldisert, US Court of Appeals for the Third Circuit, 2002 - 2003