Michael McMahon


I take a results-oriented approach to helping clients win commercial disputes and resolve compliance concerns.

Michael has extensive experience, both at Cooley and as a former Department of Justice trial attorney, leading complex commercial matters, post-acquisition disputes and internal investigations. He has represented purchasers, sellers and underwriters in more than 60 post-acquisition disputes, and he regularly provides pre-deal counseling on litigation matters in M&A transactions. Michael has served as lead trial counsel on behalf of plaintiffs and defendants in matters involving claims of fraud, trade secret misappropriation, misuse of confidential information and breach of contract, among others. He also represents companies and individuals facing investigations from federal and state government entities, such as the DOJ, the Securities and Exchange Commission, and state attorneys general offices.

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  • Cooley + Coalition Secure Strengthened Protections for Children in Immigration Custody 

  • Federal Judge Upholds Equitable Admissions Policy for Boston Exam Schools 


  • Boston College Law School
    JD, magna cum laude, 2010

  • Boston College
    BA, International Studies
    cum laude, 2004

Admissions & Credentials


Rankings & Accolades

    Best Lawyers: Ones to Watch in Commercial Litigation and Criminal Defense-White Collar