Gabriel Markoff

O'Melveny & Myers LLP

Gabriel Markoff specializes in white collar defense work, corporate investigations, and appellate litigation. In addition, he maintains an active pro bono practice working with a national non-profit civil rights group on impact litigation designed to defend minority voting rights and advance immigrants’ rights nationwide.

In his work at O’Melveny, Gabriel has taken on leadership roles in both litigation representations and investigatory matters. He has co-authored numerous briefs and prepared advocates for oral argument in the U.S. Supreme Court and federal courts of appeals, presented oral argument in the U.S. Court of Appeals for the Ninth Circuit (winning reversal of a grant of summary judgment against O’Melveny’s client), and first-chaired dozens of witness interviews in high-profile investigations.

Prior to joining O’Melveny, Gabriel served as one of the first law clerks to the Honorable Gregg J. Costa (since elevated to the Fifth Circuit) of the U.S. District Court for the Southern District of Texas. While clerking for Judge Costa, Gabriel published the first empirical survey of the effects of federal corporate prosecutions, an article that has been cited in publications including The Guardian, Financial Times, CBS MoneyWatch, and the Michigan Law Review, California Law Review, and Virginia Law Review.


  • Litigation Experience:
    • United States v. Texas (ongoing): Represents three undocumented immigrant mothers of U.S. citizens as party intervenors in the high-profile lawsuit by 26 states against the Obama Administration’s DAPA and DACA immigration initiatives
      • Led the drafting teams in authoring numerous merits briefs in the U.S. Supreme Court, U.S. Court of Appeals for the Fifth Circuit, and Southern District of Texas
      • Successfully obtained reversal of district court’s denial of intervention to O’Melveny’s clients in Texas v. United States, 805 F.3d 653 (5th Cir. 2015)
      • Prepared co-counsel for oral argument in the U.S. Supreme Court
    • Tibble v. Edison International, 135 S. Ct. 1823 (2015): Co-authored respondents’ Supreme Court merits brief and assisted oral argument preparation. Co-authored brief following remand in the Ninth Circuit, which subsequently entered judgment in favor of O’Melveny’s clients
    • Righetti v. Richman, 2016 WL 3391236 (9th Cir. June 20, 2016): Successfully presented oral argument in the Ninth Circuit, winning reversal of the district court’s grant of summary judgment against O’Melveny’s client
    • Kobach v. Election Assistance Commission, 772 F.3d 1183 (10th Cir. 2014): Part of team that obtained reversal of the district court’s injunction ordering the federal Election Assistance Commission to add a documentary proof-of-citizenship requirement to the national voter registration form
    • In confidential arbitration proceeding arising out of a corporate investigation, conducted extensive witness preparation for three testifying witnesses and second-chaired defense of two key depositions
    • Represented major corporation in complex state court class action alleging fraud in the sale of luxury properties. Drafted briefs, second-chaired a mediation that resulted in a favorable settlement for O’Melveny’s client, and conducted extensive discovery
  • Investigation and Compliance Experience:
    • Represents a major health services provider in a multi-jurisdiction investigation. Led interview team in taking dozens of witness interviews and compiling a confidential report for submission to governmental authorities
    • Represents a major international corporation in creating and operating an antitrust compliance program in cooperation with a court-appointed compliance monitor. Assisted numerous witness interviews, managed document reviews and productions, and drafted extensive compliance protocols and related documents
    • Represents a California consumer services company in pending investigation by state law enforcement authorities. Representation includes employee interviews, overseeing extensive forensic document work, and factual and legal research and analysis


  • California
  • US District Court, Northern District of California
  • US Court of Appeals, Fifth and Ninth Circuits


  • University of Texas, J.D., with high honors; Chancellors Honor Society; Articles Editor, Texas Law Review
  • Texas A&M University – Corpus Christi, B.S., Biology: summa cum laude


  • Honorable Judge Gregg J. Costa, US District Court for the Southern District of Texas


  • Bar Association of San Francisco
  • Barristers Club


Rate : $$$

What types of cases Attorney Gabriel Markoff & O'Melveny & Myers LLP can handle?
O'Melveny & Myers LLP can handle cases related to laws concerning Corporate, Litigation, White Collar Crime, Antitrust & Trade. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is O'Melveny & Myers LLP located?
O'Melveny & Myers LLP is located at Two Embarcadero Center, Embarcadero Center 28th floor, San Francisco, CA 94111, USA. You can reach out to O'Melveny & Myers LLP using their phone line 415-984-8890. You can also check their website or email them at [email protected].
How much would it cost to hire O'Melveny & Myers LLP?
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O'Melveny & Myers LLP
Two Embarcadero Center, Embarcadero Center 28th floor, San Francisco, CA 94111, USA
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