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A. Marisa Chun

Phone: +1 415.365.7408
3 Embarcadero Center, 26th Floor
San Francisco, CA 94111

A. Marisa Chun is a partner in the Litigation Group in Crowell & Moring’s San Francisco office. A first-chair trial lawyer and experienced appellate advocate, Marisa represents clients in high-stakes commercial litigation, class actions, trials, and appeals, as well as government and internal investigations involving alleged health care fraud, trade secret misappropriation, antitrust violations, sensitive #MeToo, and other matters.  Marisa focuses on thoughtful advocacy and strategies to secure an early and favorable resolution or victory if the case must be tried.  She has been recognized by The Legal 500, Benchmark Litigation, and Super Lawyers as a leading commercial and white collar lawyer and by The Recorder as a “Woman Leader in Tech Law.”

As a former television reporter, prosecutor, and senior official at the US Department of Justice, Marisa draws upon her legal, government, and media experience when advising clients and boards of directors navigating complex matters in today’s highly regulated environment. Bilingual in Korean, Marisa has significant experience advising companies and executives in the Korean technology, life sciences, and energy industries as well.   

As Deputy Associate Attorney General at the U.S. Department of Justice, she advised the Department’s leadership on various enforcement issues and oversaw certain antitrust, intellectual property rights enforcement, health care fraud, privacy, and telecommunications matters. As a prosecutor in the US Attorney’s Offices for the Eastern District of Virginia and the District of Maryland, she investigated and prosecuted cases involving narcotics trafficking, health care fraud, money laundering, export control violations, and child sex trafficking, winning every trial and appeal.

Marisa serves on the Boards of Directors of the Public Policy Institute of California and the Bar Association of San Francisco’s Justice & Diversity Center, and teaches trial advocacy at Stanford Law School as a guest instructor. She was selected by the U.S. District Court for the Northern District of California Judges to serve as a Lawyer Representative to the Ninth Circuit Judicial Conference and, in 2018, was appointed by Chief Justice Tani G. Cantil-Sakauye to the Advisory Committee on Civil Jury Instructions for the Judicial Council of California. Marisa’s pro bono work has included the representation of indigent tenants facing eviction, as well as the representation of bar associations in the United States and California Supreme Courts, in support of individuals whose constitutional rights have been violated.

Marisa served as Developments Editor of the Harvard Law Review and as a law clerk to the Honorable Robert Boochever of the U.S. Court of Appeals for the Ninth Circuit.

Representative Litigation Matters

  • Representing a major technology company in a trade secrets case, securing swift dismissal of three defendants and withdrawal of plaintiff’s preliminary injunction motion.
  • Represented a global hospitality company in defense of novel putative class action; after winning in large part a motion to dismiss, secured an early and favorable settlement for client.
  • Represented technology company in high-stakes trial and appellate litigation regarding alleged breaches of a strategic agreement involving well-known browser and search engine.
  • Represented wealth management company and executive in high-stakes employee mobility case; after winning preliminary injunction, case settled on favorable terms.
  • Represented a Software-as-a-Service (SaaS) company in a bet-the-company arbitration involving misappropriation of the client’s intellectual property, and the systematic poaching of its customers, which resulted in a significant settlement.
  • Trial counsel in patent infringement action on behalf of a technology and cybersecurity company in a nearly four-week trial involving link load balancing patents; won multi-million-dollar jury verdict in favor of client.
  • Trial counsel for a technology company in a three-week trade secret misappropriation, breach of contract, patent inventorship, and trademark case in which the jury returned a complete defense verdict on all eight trade secret claims, contract claims, and patent claim; awarded nominal damages of $1 each on the trademark claims.
  • Represented clients in privacy and Electronics Communications Privacy Act (ECPA) litigation involving allegations of video camera spying in a property rented via a global online platform; following our filing of a motion to dismiss, case settled.
  • Trial and appellate counsel for officers and directors of a major utility in high-profile shareholder derivative actions.
  • Defeated national and state consumer class actions alleging violations of the Sherman Act, Section 17200, and California Consumers Legal Remedies Act (CLRA); prevailed on dispositive motion and secured voluntary dismissal of a statewide unfair business practices action.
  • Represented employers and executives on employment matters, including defending statewide wage and hour class actions; won summary judgment in sexual harassment and constructive termination case; prevailed at trial; and resolved disputes favorably in mediation, including settlements with no or nominal monetary payments

Representative Appellate Matters

  • In a case of first impression, won the grant of a rare petition for writ of mandate for an iconic theme park and entertainment company in the California Court of Appeal, Second Appellate District, thereby vacating an order of the Superior Court denying the client’s motion to transfer venue.
  • Secured, on behalf of a well-known technology company, the summary dismissal of a petition for writ of mandate in the California Court of Appeal, Sixth Appellate District, thereby preserving a favorable trial court order regarding attorney-client privileged documents.
  • Represented aerospace company in the Fourth Circuit in an interlocutory appeal seeking to vacate an order issuing a preliminary injunction enjoining the sale of goods which allegedly bear infringing trademarks.
  • Represented the American Bar Association as amicus curiae in the U.S. Supreme Court in Lee v. United States, 137 S.Ct. 1958, 2017 WL 2694701 (2017), in support of an Asian-American immigrant; the Court held, 6-2, that a non-citizen defendant who pleads guilty based upon erroneous legal advice about the deportation consequences of a plea can establish Strickland prejudice under the Sixth Amendment.
  • Representing the Bar Association of San Francisco, the Los Angeles County Bar Association, and the Santa Clara County Bar Association in landmark constitutional challenge to California’s money bail system in the California Supreme Court in In re Humphrey, No. S247278
  • Represented the Bar Association of San Francisco and the Los Angeles County Bar Association as amici curiae in the California Supreme Court in Heller Ehrman LLP v. Davis Wright Tremaine LLP, 4 Cal. 5th 467 (2018), in support of four law firms; the Court sustained the position urged by our clients that a dissolved law firm has no property interest in legal matters handled on an hourly basis.

Representative Enforcement and Investigation Matters

  • Represented US global engineering company with respect to multiple Foreign Corrupt Practices Act (FCPA) matters, including FCPA and anti-corruption due diligence in connection with a $250 million construction project in Asia
  • Represented CEO of health care provider in a civil and criminal federal and California False Claims Act investigation of alleged health care fraud by the United States Attorney’s Office and the California Attorney General’s Office
  • Represented clients in a civil and criminal False Claims Act investigation of alleged health care fraud by the United States Attorney’s Office, DOJ’s Civil Fraud Section and the US Department of Health and Human Services (HHS) Office of Inspector General
  • Represented hospital in connection with civil and criminal False Claims Act investigation of alleged health care fraud
  • Represented a major managed care organization in a State Attorney General investigation of alleged antitrust violations with respect to market for specialized medical services; no action taken against client
  • Represented a prominent biotechnology company in an internal investigation of potential Anti-Kickback Statute violations
  • Advised major Asian energy company with respect to federal antitrust criminal matters
  • Represented high-profile, venture capital-backed health care technology company with respect to internal investigation of #MeToo sexual assault allegations involving company leadership and corporate governance issues
  • Represented a sports and leisure product company in a California Attorney General inquiry regarding alleged false advertising on a leading social networking website; no action taken against client
  • Represented an international cosmetics and skin care company in a State Attorney General investigation of alleged false advertising on client’s website; no action taken against client


  • Harvard Law School, J.D., cum laude
  • Yale University, B.A., summa cum laude


Admitted to practice: California, District of Columbia (inactive), U.S. Supreme Court, U.S. Courts of Appeals for the Ninth, Fourth, and Federal Circuits, U.S. District Courts for the Northern, Central, and Eastern Districts of California, and U.S. District Court for the Southern District of Texas.

View More

What Attys Are Saying About Calif.'s New Attorney General Law360 (March 25, 2021)
Media Mentions
California Supreme Court Issues Unanimous, Landmark Decision in Humphrey Case Challenging the Constitutionality of Money Bail (Mar.25.2021)
Firm News / Announcement
Law360's 2021 Appellate Editorial Advisory Board Law360 (March 19, 2021)
Media Mentions
"Kiel, et al. v. The Regents of the University of California, et al.: Major Takeaways from a California Court Decision Upholding a Flu Vaccination Mandate and Implications for the COVID-19 Vaccine," National Association of College and University Attorneys in NACUA Notes, Vol. 19, No. 2 (December 22, 2020). Co-Authors: A. Marisa Chun, Laurel Pyke Malson and Suzanne E. Rode.
LITIGATION NOTE: Crowell & Moring Defeats Preliminary Injunction Motion, Securing Swift Dismissal of Case Seeking to Halt University of California Flu Vaccination Requirement (Dec.21.2020)
Firm News / Announcement
Benchmark Litigation Recognizes Partners Laura Foggan and Marisa Chun (Aug.18.2020)
Firm News / Announcement
Crowell & Moring Represents University of California in Suit against Department of Homeland Security over International Student Directive (Jul.16.2020)
Firm News / Announcement
"Business Disruption in a Pandemic: What Commercial Office Lease Issues Do You Need to Consider?" Crowell & Moring Webinar (April 22, 2020). Presenters: Gregory D. Call, A. Marisa Chun, and Allyson McKinstry.
Attorneys Are Busy Persuading Authorities Their Client's Business Is Essential Daily Journal (April 17, 2020)
Media Mentions
"Give Us A Break: Students Filing Tuition Refund Class Actions Against Universities Over COVID-19 Disruptions," (April 14, 2020). Contacts: Laurel Pyke Malson, A. Marisa Chun, J. Daniel Sharp
Client Alert / Newsletter

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Crowell & Moring LLP is an international law firm with approximately 550 lawyers representing clients in litigation and arbitration, regulatory and policy, and transactional matters. The firm is internationally recognized for its representation of Fortune 500 companies in high-stakes litigation, as well as its ongoing commitment to pro bono service and diversity, equity and inclusion. The firm has offices in Brussels, Doha, London, Los Angeles, New York, Orange County, San Francisco, Shanghai, and Washington, D.C.

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