Arjun Jaikumar represents clients at all stages of white-collar criminal investigations and litigation, as well as in complex civil litigation. He has represented clients in a wide range of industries, including health care, energy, commodities trading, financial services, insurance and entertainment, and has litigated in state and federal courts around the country. He has experience in matters related to the Foreign Corrupt Practices Act, money laundering, insider trading, securities fraud and insurance fraud.

Mr. Jaikumar also maintains an active pro bono practice, in which he has represented human trafficking victims, low-income families seeking public benefits, asylum seekers and Title VII plaintiffs alleging race-based employment discrimination. He has argued several motions and drafted multiple appellate briefs in state and federal court on behalf of pro bono clients.

In 2021, Mr. Jaikumar served as a Special Assistant District Attorney with the Middlesex County District Attorney’s Office, where he was responsible for litigating criminal cases at all stages through trial.

Mr. Jaikumar first joined WilmerHale as a summer associate in 2013. From 2015 to 2017, he served as a law clerk to the Honorable Marsha S. Berzon of the US Court of Appeals for the Ninth Circuit, and to the Honorable Richard G. Stearns of the US District Court for the District of Massachusetts.

During law school, Mr. Jaikumar was an articles editor for the Columbia Law Review and served as chapter president of the American Constitution Society. Prior to law school, he worked for the Democratic Senatorial Campaign Committee and was a contributing editor for Daily Kos.   


  • Selected for inclusion in the 2022 and 2023 editions of Best Lawyers: Ones to Watch in the areas of appellate, commercial litigation and white-collar criminal defense.

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  • Education

    • JD, Columbia Law School, 2014

      Articles Editor, Columbia Law Review, James Kent Scholar, Harlan Fiske Stone Scholar
    • BS, History and Theatre, Northwestern University, 2005

  • Admissions

    • Massachusetts

    • New York

  • Clerkships

    • The Hon. Marsha S. Berzon, US Court of Appeals for the Ninth Circuit

    • The Hon. Richard G. Stearns, US District Court for the District of Massachusetts