Hannah Y. Chanoine


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As Co-Chair of O’Melveny’s Consumer Class Actions Practice, Hannah Chanoine focuses on defending and advising companies in a diverse range of class action matters in the trial and appellate courts.

Hannah began her career clerking for the Hon. Sonia Sotomayor on the Second Circuit Court of Appeals, and then served as a trial attorney in the Department of Justice, Civil Division (Federal Programs Branch) through the Attorney General's Honor's Program. Hannah received her JD from Columbia University School of Law, where she was twice named a James Kent Scholar for outstanding academic achievement. Hannah is currently member of the adjunct faculty at Columbia Law School, where she co-teaches a course on US Food Law and Policy.

Honors & Awards

  • Recommended by The Legal 500 US for General Commercial Disputes (2020); Product Lability, Mass Tort and Class Action - Defense (2021, 2022); Product Liability, Mass Tort and Class Action - Defense: Consumer Products (Including Tobacco) (2022)
  • Super Lawyers, New York Metro “Rising Stars,” (2011- 2016)


Bar Admissions

  • New York
  • Massachusetts 

Court Admissions

  • US Supreme Court
  • US District Court, Northern District of Florida, Middle District of Georgia, Central District of Illinois, Eastern District of Michigan, and Eastern and Southern Districts of New York
  • US Court of Appeals, First, Second, Third, Sixth, Seventh, Ninth, and Eleventh Circuits
  • United States Court of Federal Claims


  • Columbia Law School, JD, 2004; Winner: 2004 Columbia Law Review Publishable Notes Competition, James Kent Scholar (2002-2003 and 2003-2004)
  • Wellesley College, BA, magna cum laude, 1998; Economics, Phi Beta Kappa

Professional Activities


  • Honorable Sonia Sotomayor, US Court of Appeals, Second Circuit

Faculty Member

  • Columbia University School of Law, Lecturer-in-law, US Food Law & Policy


  • American Bar Association: “26th Annual National Institute on Class Actions,” Scottsdale (10 November 2022)
  • ACI Advanced Food Law and Marketing Symposium: “Class Action Strategies: Practical Pointers for Avoiding and Resolving Claims in Light of Plaintiff Bar’s Continuously Evolving Theories,” New York (1 April 2020)
  • Michigan State University Institute for Food Laws and Regulations, Global Food Law Current Issues Conference 2018, “Managing Class Action Litigation Risk - Label Workshop,” East Lansing (20 June 2018) 
  • OMM CLE Marathon: “Good Corporate Citizenship Efforts: CSR and Pro Bono”, New York (16 May 2018)
  • ACCP Annual Conference 2018: “When to Check with Legal: Navigating Complex CSR Waters,” Portland (19 Mar 2018)
  • GMA Legal Conference 2018: “It’s Raining Cats and Dogs: Increasing Litigation Against Pet Food Companies” New Orleans (28 Feb 2018)
  • Conference Co-Chair:  ACI Defending and Managing Class Actions Conference, New York (3-4 April 2017)
  • CLE International, Food Law: The Evolving Food Law Landscape Conference, “Hullabaloo about Healthy: Nutrition Bars, Total Fat, and the Like,” Austin (11-12 May 2017)
  • PLI 22nd Annual Consumer Financial Services Institute, “Class Action Developments and Settlements,” Chicago (4 May 2017)
  • ACI Defending and Managing Class Actions Conference, “Tackling the Unique Ethical Considerations in Class Actions CLE," New York, (3-4 April 2017)
  • GMA Legal Conference 2017: “Lessons Personal Care and Household Product Companies can Learn from Food Industry Litigation Battles,” San Diego (27-28 Feb 2017)
  • FDLI Food Advertising, Labeling and Litigation Conference, “Litigation Proofing, Litigation Strategy, and Risk-Management,” (15 September 2016)
  • Michigan State University: Food Law Current Issues Conference, “Food Law Litigation Landscape: Trends and Emerging Legal Risks,” (12-14 July 2016)
  • WeiserMazars Food and Beverage Industry CFO Bootcamp “Investing in Food & Beverage Companies: Assessing a Target company’s Litigation Risk Profile During Due Diligence,” (15 June 2016)
  • PLI 21st Annual Consumer Financial Services Institute, “Class Action Developments and Settlements,” Chicago (12 May 2016)
  • PLI 21st Annual Consumer Financial Services Institute, “Class Action Developments and Settlements,” New York (4 April 2016)
  • CLE International Food Law Conference, “Trans Fat: Not ‘Generally Recognized as Safe,’” (17-18 March 2016)
  • FDLI Food Advertising and Litigation Conference, “Insights into the Food Court and Key Cases,” (24 September 2015)


  • Companies Face Demand for Third-Party CSR Certifications,” CFO.com (26 November 2019)
  • “Managing Investor Risk in Food and Beverage Industry,” New York Law Journal (8 September 2016)
  • “Hain Celestial ‘Natural’ Case Could Set Precedent Favorable To Industry,” Pharma & MedTech Business Intelligence’s, The Rose Report (16 April 2015)
  • “Non-Capital Stay Applications In The United States Supreme Court: A Procedural Primer,” Certworthy (2010)
  • “Clarifying the Joint Action Test for Media Actors When Law Enforcement Violates the Fourth Amendment,” 104 Columbia Law Review 1356 (2004)


  • Federal Bar Council: Second Circuit Courts Committee, Inn of Court 


  • Federal Bar Council Foundation
  • Defending and advising consumer packaged goods companies in nationwide false advertising cases.  Hannah has represented leading manufacturers and retail distributors of whitening toothpaste, coconut water, pet food, household cleaners, flavored olive oil, Greek yogurt, personal care products, kombucha, baking products, probiotic baby food, juice beverages and many other consumer  products. Hannah counsels CPG clients up and down the supply chain on strategies for mitigating class action litigation risk during product and label development, and advises investors conducting due diligence on the class action litigation risk profiles posed by potential targets. 
  • Defending leading HD television distributor in nationwide class action alleging deceptive marketing relating to energy efficiency.
  • Defending a major satellite radio broadcaster in class action lawsuit alleging over $1 billion in damages for violations of novel intellectual property rights.
  • Defending products manufacturer against class action claim based on novel tort theory seeking comprehensive injunctive relief valued at over $200 million.
  • Serving as counsel for trade associations and business oriented advocacy groups as amici curiae addressing cutting edge class action issues in federal courts of appeal and the U.S. Supreme Court.