Megan A. Siddall

Partner

Megan Siddall is a trusted criminal defense and white-collar defense attorney with experience representing individuals and organizations in all phases of criminal litigation, including pre-indictment investigations, trials, sentencing, and appeals. She has defended individuals and organizations against a broad range of criminal charges, including RICO offenses, health care fraud, financial crimes, tax fraud, securities fraud, drug offenses, and other major felonies. Ms. Siddall also represents individuals and organizations in parallel civil litigation and government enforcement actions.

Ms. Siddall has extensive experience in scientific research misconduct investigations, parallel civil suits, and False Claims Act investigations. She has successfully represented parties in research misconduct investigations involving allegations of plagiarism, image manipulation, and data falsification.

A former graduate student in philosophy, Ms. Siddall especially enjoys the research and writing required to craft a persuasive brief. She maintains an active appellate practice. She has briefed and argued complex cases before the U.S. Court of Appeals for the First Circuit and the Massachusetts Appeals Court.

Prior to joining Cloherty & Steinberg, Ms. Siddall was a founding partner of a Boston-based white-collar defense firm. She was also previously associated with Williams & Connolly in Washington, DC. After law school, Ms. Siddall clerked for the Honorable John G. Koeltl of the United States District Court for the Southern District of New York.

  • Massachusetts

    New York

    District of Columbia

    U.S. District Court, District of Massachusetts

    U.S. District Court, Southern District of New York

    U.S. District Court, District of Columbia

    U.S. Court of Appeals, First Circuit

  • Harvard Law School, J.D., cum laude; Managing Editor, Harvard Civil Rights - Civil Liberties Law Review

    University of North Carolina - Chapel Hill, M.A.

    Georgetown University, B.A., magna cum laude

  • Co-Chair, Boston chapter, Women’s White Collar Defense Association

    Criminal Justice Act Panels for the District of Massachusetts and the First Circuit

    CPCS Post-Conviction Panel

    Co-Chair, Women’s Bar Association, Women in the Courtroom Committee

    National Association of Criminal Defense Lawyers

    Massachusetts Association of Criminal Defense Lawyers

    Boston Bar Association

  • Criminal Defense

    Panelist, “Individual Cooperation: Risks, Rewards, and the Ride,” Boston Bar Association White Collar Conference, 2024

    Author, “Intended Loss Under the Sentencing Guidelines,” NACDL’s The Champion, 2023

    Panelist, “Charging and Sentencing,” Boston Bar Association White Collar Conference, 2022

    Speaker, “Hot Topics in State and Federal Criminal Defense,” Boston Bar Association, 2019

    Co-author, “Federal prosecutorial policy a step backwards,” Massachusetts Lawyers Weekly, 2017

    Research Misconduct

    Panelist, “The PHS Final Rule on Research Misconduct: What You Need to Know,” Boston Bar Association, 2024

    Speaker, “Don’t Gamble with Your Institution’s Reputation: Compliance Risks Facing Academic Researchers and the Universities that Employ Them,” Society of Research Administrators International Annual Meeting, 2022

    Other

    Panelist, “Finding Your Voice in the Courtroom,” Women’s Bar Association, 2023

    Guest, How I Lawyer Podcast, 2021

    Guest, Mom Life and Law Podcast, 2021

  • Examples of Ms. Siddall’s accomplishments include:

    Obtained dismissal of complaint alleging fraudulent inducement and breach of contract against artist brought by fast fashion company seeking to rescind prior settlement agreement.

    Obtained jury verdict and award of attorneys’ fees in favor of police officer against municipal employer.

    Obtained dismissal of multiple charges and acquittal on one count of aiding or assisting in the preparation of a false tax return at jury trial.

    Won appeal in the First Circuit in case of first impression regarding credits against loss under the Sentencing Guidelines.

    Obtained complete dismissal of securities fraud lawsuit against client in tech industry.

    Obtained sentence of home confinement for client convicted of insider trading.

    Obtained highly favorable resolution of securities fraud complaints brought by the Massachusetts Securities Division and the Securities Division of the Office of the Attorney General of the State of South Carolina.

    Avoided criminal charges against individual under investigation for securities fraud in connection with alleged pump and dump stock scheme.

    Resolved wage and hour investigation without criminal charges.

    Negotiated highly favorable early settlement of putative class action against asphalt manufacturer.

    Obtained favorable settlement on behalf of plaintiff minority shareholders in breach of fiduciary duty lawsuit on eve of trial.

  • Chambers USA, White-Collar Crime and Government Investigations, 2025

    Massachusetts Lawyers’ Weekly, Top Women of Law, 2025.

    Best Lawyers, Criminal Defense: White-Collar, 2024-2026

    Best Lawyers, Criminal Defense: General Practice 2025-2026

    Best Lawyers, Lawyer of the Year, Criminal Defense: General Practice 2026

    Massachusetts, SuperLawyers, White Collar Criminal Defense, 2021-2025

    Massachusetts, SuperLawyers Rising Star, White Collar Criminal Defense, 2016-2020

    D.C. SuperLawyers Rising Star, General Litigation, 2014

    Boston Magazine, Top Lawyers, Criminal Defense, 2021-2024

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