Samuel Leifer has a diverse practice representing clients in a variety of litigation matters. His practice focuses on complex, commercial litigation matters, including contract disputes, patent litigation, class action lawsuits and business torts. He has also represented clients in government-facing matters under the False Claims Act, Federal Trade Commission Act and Communications Decency Act. He has represented corporations, boards, directors and officers, and individuals, both as defendants and plaintiffs.

Mr. Leifer has experience at all levels of litigation, from drafting complaints, to running fact and expert discovery, to participating in multiple trials, to appeals in both State and federal appellate courts, to petitions in the United States Supreme Court. He has first-chaired multiple depositions, ranging from deposing the CEO of a multi-billion-dollar company to questioning electrical engineers on highly technical details of electronic circuitry and mathematical calculations. He has argued multiple times in federal court and participated in both jury and bench trials, including preparing fact and expert witness examinations, and has secured successful verdicts for his clients. Mr. Leifer also has experience in the alternative dispute resolution setting, including successful arbitrations, mediations and settlement discussions.

Additionally, Mr. Leifer has dedicated himself on numerous pro bono matters, including successfully representing multiple veterans in their appeals to the United States Court of Appeals for Veterans Claims. He has likewise represented pro bono clients in appealing constitutional claims in US Courts of Appeals and in the United States Supreme Court. He also volunteers his time every year to work with local middle school students participating in mock trials and mock appeals.

Prior Experience

Prior to joining WilmerHale, Mr. Leifer was a litigation associate at Wachtell, Lipton, Rosen & Katz and clerked for the Honorable A. Raymond Randolph of the US Court of Appeals for the District of Columbia Circuit. While pursuing his legal education, Mr. Leifer worked as a student attorney in the Michigan Law School Child Advocacy Law Clinic. Prior to law school, he served as an AmeriCorps program coordinator for a nonprofit in San Angelo, Texas, dedicated to repairing homes of military veterans, seniors and those with disabilities. Mr. Leifer also worked as legislative correspondent for US Senator Sheldon Whitehouse.


Insights & News


  • Education

    • JD, University of Michigan Law School, 2015

      magna cum laude

      Order of the Coif; Certificate of Merit in Criminal Law, Torts and Civil Procedure; Honors in Legal Writing

      Notes Editor, Michigan Law Review 

    • BA, Psychology and Philosophy, Johns Hopkins University, 2008

      Phi Beta Kappa, Dean’s List
  • Admissions

    • Massachusetts

    • New York

    • US Court of Appeals for the District of Columbia Circuit

    • US Court of Appeals for the Second Circuit

    • US District Court for the Eastern District of New York

    • US District Court for the Southern District of New York

  • Clerkships

    • The Hon. A. Raymond Randolph, US Court of Appeals for the District of Columbia Circuit, 2015 - 2016



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