Jonathan Hacker


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Jon Hacker chairs O’Melveny’s Supreme Court and Appellate Litigation Practice and resides in the firm’s Washington, DC office.

Top-ranked by Chambers USA since 2012, Jon is regarded by peers as “a phenomenal writer” and “a forceful advocate.” He has authored briefs in dozens of US Supreme Court cases at both the merits and certiorari stages. He has argued six cases in the US Supreme Court and appeals in every federal circuit. He has also briefed and argued appeals in numerous state courts, including New York, California, Ohio, Pennsylvania, Florida, Massachusetts, New Jersey, Maine, Montana, Nebraska, and the District of Columbia. Clients praise him as “such a down-to-earth person but an unparalleled oral advocate.”


Honors & Awards

  • Recognized by Best Lawyers® 2021 for Appellate Practice in Washington, DC
  • Recognized by The Legal 500 US  as a Leading Lawyer for Appellate (2020); Listed in The Legal 500 US since 2017
  • Repeatedly selected as a leading US appellate lawyer by Chambers
  • “Local Litigation Star,” Benchmark Litigation (2018-2020)
  • “Litigator of the Week,” The American Lawyer (August 2015)
  • “Rising Appellate Star,”  The Wall Street Journal (January 2011)
  • “Appellate Lawyer of the Week,” National Law Journal (2011)


Bar Admissions

  • District of Columbia
  • Maryland

Court Admissions

  • US Supreme Court
  • All federal circuit courts of appeal
  • US District Court, District of Columbia 


  • University of Michigan, J.D., 1995:  magna cum laude; Order of the Coif; Henry M. Campbell Memorial Scholarship (Law School’s highest award for graduates); Managing Editor, 1994-95, Associate Editor, 1993-94, Michigan Law Review; Winner, Campbell Moot Court Competition, 1994
  • Harvard College, A.B., 1990 (Social Studies): cum laude

Professional Activities


  • Honorable Bruce M. Selya, US Court of Appeals, First Circuit


  • Co-Chair, National Association of Criminal Defense Lawyers, Supreme Court Amicus Committee
  • Barrister, Edward Coke Appellate Inn of Court

Co-Founder and Co-Director

  • HLS Supreme Court and Appellate Advocacy Clinic, Harvard Law School

Press Releases

In the News

Law360: The Funniest Moments Of The Supreme Court’s Term

July 13, 2020

Law360: The Firms That Won Big At The Supreme Court

July 10, 2020

The National Law Journal: General Litigation Finalist: O’Melveny & Myers

May 26, 2020

Law360: Stay In Your Lane, High Court Tells Feds In Bridgegate

May 8, 2020

Bloomberg Law: Scope of Foreign Arbitration in GE Unit Case Divides Justices

January 22, 2020

Law360: Justices Zero In On Consent In Steel Plant Arbitration Fight

January 21, 2020

Supreme Court Brief: Argument Today: International Arbitration

January 21, 2020

Law360: Up Next At High Court: Arbitration, Church-State Separation

January 17, 2020

Law360: Nonsignatories Can't Force Arbitration, High Court Hears

November 25, 2019

The National Law Journal: Appellate Hot List 2019- O’Melveny & Myers

October 25, 2019

Law360: Justices Turn Away Chevron Workers’ 401(k) Fee Challenge

May 28, 2019

Law360: Law360’s Weekly Verdict: Legal Lions & Lambs

February 28, 2019

American Lawyer: Shout-Out: O’Melveny Wins Freedom for Pro Bono Client

December 4, 2018

The National Law Journal: Appellate Hot List 2018: O’Melveny & Myers

October 26, 2018