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Lieff, Cabraser, Heimann & Bernstein, LLPPartner
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Sean A. Petterson

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250 Hudson Street, 8th Floor, New York, NY 10013

About Sean A. Petterson

Sean A. Petterson is a partner in Lieff Cabraser’s New York office. He is a member of the firm’s cybersecurity/data privacy practice group. As a member of that group, he focuses on nationwide data breach class actions. He was recently appointed to the Plaintiffs’ Steering Committee in the nationwide In re: Snowflake, Inc., Data Security Breach Litigation. Additionally, he works on the pending nationwide data breaches against Marriott and Quest Labs, with a particular focus on experts. Along with his data breach work, Mr. Petterson represents truck drivers in two proposed class actions brought under the Illinois Biometric Information Privacy Act against two technology providers.

Mr. Petterson is also a member of the firm’s securities practice group. Sean’s successful cases include a shareholder derivative action against The Boeing Company’s officers and directors [hyperlink: https://lieffcabraser.com/securities/boeing/ ]. Sean represented Co-Lead Plaintiffs the New York State Comptroller Thomas P. DiNapoli, as trustee of the New York State Common Retirement Fund, and the Fire and Police Pension Association of Colorado in the action alleging breach of fiduciary duty in connection with the board of directors’ oversight of the 737 MAX’s design and development. In February 2022, the Delaware Chancery Court approved a settlement comprised of a $237.5 million cash payment and extensive corporate governance reforms.

Sean was also a member of the Lieff Cabraser team representing Co-Lead Plaintiff Fire and Police Pension Association of Colorado in a shareholder derivative action against Wells Fargo’s current and former officers and directors [hyperlink: https://lieffcabraser.com/securities/wells-fargo/ ] arising from the illicit sales practices scandal. The case settled for a $240 million cash payment and corporate governance reforms in April 2020. The settlement represents the largest insurer-funded derivative settlement in history.

Sean is also a member of the firm’s consumer protection practice group, where he has helped successfully resolve cases brought under the Telephone Consumer Protection Act [hyperlink https://lieffcabraser.com/consumer/tcpa-cases/ ]. And, finally, Sean is currently representing retired pastors in the In Re: AME Church Employee Retirement Fund Litigation, MDL No. 3035.

Sean has been named “Ones to Watch” by Best Lawyers from 2021-2025 and a Rising Star for the New York Metro Area by Super Lawyers from 2021-2024. He has spoken at conferences regarding data breach litigation, with a particular focus on Article III standing and damages.

Prior to joining Lieff Cabraser, Sean was an associate at Boies Schiller Flexner, LLP from 2015-2018. He is a 2015 graduate from New York University School of Law with a Juris Doctor, where he was a Robert McKay scholar and a Senior Quorum Editor for the Journal of Legislation and Public Policy. Sean also graduated summa cum laude from Brandeis University with a B.A. in both History and American Studies.

Honors & Awards

•“Ones to Watch,” Best Lawyers, 2021-2026
•“Lawdragon 500 Leading Plaintiff Consumer Lawyers in America,” Lawdragon, 2025, 2026
•“Rising Star for New York Metro Area,” Super Lawyers, 2021-2025

In the News

•February 17, 2026
30 Lieff Cabraser Attorneys Recognized as Lawdragon “500 Leading Plaintiff Consumer Lawyers” for 2026
•October 30, 2025
21 Lieff Cabraser Attorneys Selected as 2025 New York Metro Super Lawyers and Rising Stars
•August 21, 2025
36 Lieff Cabraser Lawyers Named to 2026 Best Lawyers Listings
•February 28, 2025
33 Lieff Cabraser Attorneys Recognized as Lawdragon “500 Leading Plaintiff Consumer Lawyers” for 2025
•October 25, 2024
18 Lieff Cabraser Attorneys Selected as 2024 New York Metro Super Lawyers and Rising Stars

 

Sean A. Petterson (New York, New York) View website

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Services

Practice Details

Experience

  • Bar Admission & Memberships
    Admissions
    2016, New York
    2017, U.S. District Court, Eastern District of New York
    2017, U.S. District Court, Southern District of New York
    2018, U.S. Court of Appeals for the Eleventh Circuit
    2018, U.S. District Court, Northern District of Illinois
    2022, U.S. Court Of Appeals, Fourth Circuit
    2022, U.S. District Court, Central District of Illinois
  • Education & Certifications
    Law School
    New York University School of Law, New York, NY
    Class of 2015
    J.D.
    Other Education
    Senior Quorum Editor, Journal of Legislation and Public Policy

    Robert McKay Scholar

    Brandeis University, Waltham, MA
    Class of 2011
    B.A.
    History and American Studies, Summa Cum Laude

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Attorneys FAQs

  • What year was this attorney first admitted to the bar?
    Sean A. Petterson was admitted in 2016 to the State of New York.
  • Is this attorney admitted to practice in any U.S. Federal Courts?
    Sean A. Petterson is admitted to practice before the United States Court of Appeals for the Eleventh Circuit, United States Court of Appeals for the Fourth Circuit, United States District Court for the Central District of Illinois, United States District Court for the Eastern District of New York, United States District Court for the Northern District of Illinois and United States District Court for the Southern District of New York.
  • How many attorneys are in this law firm?
    Lieff, Cabraser, Heimann & Bernstein, LLP has 100 attorneys at this location.
  • What law school did this attorney attend?
    Sean A. Petterson attended New York University School of Law, New York, NY.
  • Is this attorney listed in the Bar Register of Preeminent Lawyers?
    Sean A. Petterson is listed in the Antitrust Law, Aviation Law, Civil Rights, Civil Trial Practice, Environmental Law, Labor and Employment Law, Personal Injury, Product Liability Law, Securities Law and Toxic Torts section of the Bar Register of Preeminent Lawyers.

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