ARIANA J. TADLER is the founding partner of Tadler Law LLP, a WBENC-certified, women-owned boutique law firm that offers an array of litigation and legal counseling services. With 30 years’ experience advocating for consumers and investors against corporate fraud and abuse while litigating and managing securities, consumer and data breach class actions, and complex litigation, Ariana is one of the leading women litigators in the country. Described by Chambers USA as one who “passionately defends her clients’ interests to the greatest extent possible,” Ariana litigates large, complex, high-profile cases. She is sought after for her unique legal and technological acumen and case management skills.

A tough, solution-driven negotiator with a creative and robust aptitude for resolving disputes, Ariana is regularly appointed by courts to leadership positions in large, complex federal, multi-district, and state coordinated proceedings because of her extensive experience managing complex litigation. Ariana is also recognized as one of the nation’s leading authorities on electronic discovery and pioneered the establishment of an e-Discovery Practice group within a plaintiffs’ firm structure 20 years ago. Her exceptional skills and knowledge in the field of e-Discovery have distinguished her among her litigation peers. She remains the only plaintiffs’ lawyer to be ranked repeatedly as a Band 1 e-Discovery Practitioner by Chambers and Partners in the Global-USA and USA-Nationwide categories, an unprecedented achievement. Exterro has announced that Ariana is the recipient of the 2023 Honorable Shira Scheindlin Lifetime Achievement Award to be presented at Exterro Xchange.

In 2017, United States Supreme Court Chief Justice Roberts appointed Ariana to serve on the Federal Civil Rules Advisory Committee, and in December 2020, Chief Justice Roberts renewed her appointment to serve a second term. In July 2023, Chief Justice Roberts renewed Ariana’s appointment to serve by an additional year. By the Committee Chair’s appointment, she serves on subcommittees focused on specific aspects of the federal civil rules, including Multidistrict Litigation (MDL) and Discovery.

Ariana regularly speaks on various litigation and discovery-related topics, authors leading articles, and develops best practice tips and tools, including The Jumpstart Outline (original author; now in its third edition), published by The Sedona Conference®. She served for five years as Chair and is currently Chair Emeritus of The Sedona Conference®’s Steering Committee for Working Group 1 on Electronic Document Retention and Production, the preeminent “think tank” on e-Discovery. She also sits on the Advisory Board of Georgetown University Law Center’s Advanced e-Discovery Institute, where she has helped educate federal judges and lawyers on e-Discovery issues. Ariana previously served as the Executive Director for the Board of Advisors of the Benjamin N. Cardozo School of Law’s Data Law Initiative (CDLI).

In addition to industry-focused programs, Ariana serves as a guest lecturer nationwide, teaching students practical skills to prepare them for the real-life practice of law and women tips and tools for leadership, entrepreneurship, and business management.

Ariana is also a professional and keynote speaker. She speaks on an array of topics stemming from her decades of experience as a lawyer, entrepreneur, founding partner, business owner, woman in tech, mentor, and mother. Ariana is an active member of the New York City Chapter of the National Speakers’ Association.

Ariana is a proud alumna of Hamilton College and Fordham University’s School of Law. An avid learner, Ariana achieved a certificate in Women’s Entrepreneurship from Cornell University in March 2022. 

Ariana was a Founding Principal and served as a consultant to Meta-e-Discovery LLP, an independent data hosting management and consulting company. In March 2023, Repario Data was created and includes the integration of Meta-e Discovery with several other service providers, and Ms. Tadler has a limited equity interest in Repario Data. Ms. Tadler engages in certain independent work that leads to business introductions to other business entities, including Repario Data, from which she and/or Tadler Law derive revenue.

Fordham University School of Law, J.D. – 1992

Hamilton College, B.A. – 1989

Cornell University, Certificate in Women’s Entrepreneurship – 2022

Consumer Plaintiffs’ Steering Committee, In re Marriott International, Inc. Custom Data Security Breach Litigation

Plaintiffs’ Co-Class Counsel, Adkins v. Facebook, Inc. (“Facebook Data Breach”)

Plaintiffs’ Executive Committee, In re Apple, Inc. Device Performance Litigation

Plaintiffs’ Steering Committee, In re Equifax, Inc. Customer Data Breach Litigation

Plaintiffs’ Executive Committee, In re Yahoo! Inc. Customer Data Breach Security Litigation

Plaintiffs’ Steering Committee, In re Target Corp. Customer Data Security Breach Litigation

Plaintiffs’ Executive Committee, In re Intuit Data Litigation

Plaintiffs’ Counsel, Torres v. Wendy’s International, LLC

Lead Counsel, In re Conagra Foods, Inc.

Lead Counsel, In re General Mills, Inc. Kix Cereal Litigation

Plaintiffs’ Co-Lead Counsel, In re ARIAD Pharmaceuticals, Inc. Securities Litigation

Lead Counsel, In re Ener1 v. PricewaterhouseCoopers

Special Discovery Counsel, In re Republic of Colombia v. Diageo North America, Inc.

Plaintiffs’ Liaison Counsel, Lead Counsel, and Executive Committee Member, In re Initial Public Offering Securities Litigation

Martindale Hubbell®:

  • AV Preeminent Rating® Judicial Edition (2018-2023)
  • AV Preeminent Rating™ (2008-2023)

Top Rated Woman Leader in Law (2021)
Best Lawyers:

  • Mass Tort Litigation / Class Actions – Plaintiffs (2020-2023)
  • Long Island Lawyer of the Year – Mass Tort Litigation / Class Actions – Plaintiffs (2023)

Chambers and Partners:

  • 2023 Global Guide BAND 1 – E-Discovery & Information Governance
  • 2022 Global Guide BAND 1 – E-Discovery & Information Governance
  • 2021 Global Guide BAND 1 – E-Discovery & Information Governance
  • 2020 Global Guide BAND 1 Litigation: E-Discovery
  • 2019 Global Guide BAND 1 Litigation: E-Discovery
  • 2021 USA – Nationwide E-Discovery & Information Governance – Plaintiffs
  • 2020 USA – Nationwide  BAND 1 E-Discovery & Information Governance
  • 2019 USA – Nationwide  BAND 1 – Litigation: E-Discovery

Lawdragon – 500 Leading Plaintiff Financial Lawyers (2021-2022)

The Legal 500:

  • 2021 Leading Lawyer E-Discovery
  • 2020 United States: TIER 2-E-Discovery

National Law Journal: 2020 Plaintiffs’ Lawyers Trailblazers List

Super Lawyers:

  • New York Metro Super Lawyers (2010-2022)
  • Top 50: Women New York — Metro Super Lawyers” (2014-2020)
  • Top 100: New York — Metro Super Lawyers (2015-2019)

U.S. News & Best Lawyers: Best Lawyers in America:

  • 2021 U.S. E-discovery and Information Governance
  • 2020 Mass Tort Litigation / Class Actions – Plaintiffs

Who’s Who Legal – Litigation:

  • 2022 Global Elite Thought Leader Commercial Litigation – E-Discovery
  • 2021 Global Leader Commercial Litigation – E-Discovery Lawyers
  • 2020 E-Discovery Global Elite Thought Leader
  • 2015-2019 Leading Practitioner-E-Discovery

American Bar Association’s Legal Technology Resource Center’s (LTRC) Women of Legal Tech (2017)

Accordion Content

  • Keynote Speaker, “Top Trends That Influence Us All” (Tech Up for Women Conference 2022, 11/15/22)
  • Panelist, “The Reality of Stress & Mental Health and the Bright Horizon for Behavioral Telehealth” (Columbia Business School, 11/10/22)
  • Presenter, “ESI Protocols: To Have or Not to Have” (University of Florida’s 9th Annual Law E-Discovery Conference, Virtual, 03/23/22)
  • Presenter, “The Future for A Remote Law Firm: How Do We Keep Our Teams Engaged?” (WOL Monthly Meeting – Table Talks, Virtual, 02/09/2022)
  • Presenter, “Procedure Beyond Rules: Are ESI Protocols as Helpful as We Think They Are?” (Georgetown Law 2021 Advanced eDiscovery Institute, 11/19/2021)
  • Presenter, “Learning from this Nationwide Pilot Project—Reducing the Costs and Delay of Civil Litigation” ( IAALS’ Paths to Justice Summit Series, Virtual, 09/09/2021)
  • Presenter, “Structure for Success…and Sanity” (International Tech Up For Women IFA Berlin Conference 2021, Virtual, 09/02/2021)
  • Presenter, “Learning from this Nationwide Pilot Project: A Convening on Reducing the Costs and Delay of Civil Litigation” (IAALS’ Paths to Justice Convening, Virtual, 08/25/2021)
  • Presenter, “Electronically Stored Information (ESI): Discovery Requests and Responses” (Practising Law Institute’s Hot Topics in Electronic Discovery 2021: What Corporate and Outside Counsel Need to Know, Virtual, 05/05/2021)
  • Presenter, “Duties of the Responding Party” (AAJ: Rule 30(b)(6) Series: Rule 30(b)(6) Has Been Amended! Learn About the New Rule and How To Use It, Virtual, 04/14/2021)
  • Guest Lecturer, “Proportionality: Weapon or Shield? Assessing the Burden and Cost of E-Discovery” (University of Florida Fredric G. Levin College of Law, 03/18/2021)
  • Presenter, “How to Be Innovative in Your Business Development Efforts” (Women Owned Law, 2021 Virtual Symposium, Pivoting Forward Together, Women Entrepreneurs at the Cutting Edge of Law,, 03/18/2021)
  • Presenter, “8th Annural e-Discovery Conference” (University of Florida – Frederic G Levin College of Law, 03/18/2021)
  • Interview, “ESI Survival Guide” (Interviewed by M. Knouff, CDS, Virtual, 03/05/2021)
  • Panelist, “Tea Time With Angeion” (Virtual, 03/04/2021)
  • Presenter, “Work/Life Balance in the COVID Era” (Tea Time with Angeion Series,Virtual, 03/04/21)
  • Faculty, “” (The Sedona Conference Institute-eDiscovery Negotiation Training: Practical Cooperative Strategies, Virtual, 02/09/2021 – 02/11/2021)
  • Moderator, “Explore Cyber Security Initiatives for 2021” (Tech Up for Women 2020 Conference, Virtual, 11/17/2020)
  • Presenter, “A New World: Virtual Litigation Practice in a Pandemic” (Women Lawyers of Jefferson County Annual Meeting, Virtual, 11/12/2020)
  • Guest Lecturer, “Consumer Class Actions: The Future of Consumer Class Actions: The Pendulum Swing in the Courts, Congress, Executive Agencies, and the States?” (University of Michigan Law School, Virtual, 11/09/2020)
  • Guest Lecturer, “E-discovery” (Loyola University Chicago School of Law, Virtual, 10/20/2020)
  • Presenter, “E-Discovery in Class Actions: Trends and Developments” (Mass Torts Made Perfect Virtual Vegas – Class Actions Track, 10/14/2020)
  • Presenter, “Third-Party Litigation Funding, the Health of the Plaintiffs’ Bar, and You” (Mass Torts Made Perfect Virtual Vegas – Class Actions Track, 10/14/2020)
  • Presenter, “Rule 23 Amendments: How They Are Reshaping Class Action Settlements & What Attorneys Need to Know” (HB Litigation Conferences & Western Alliance Bank, Virtual, 10/07/2020)
  • Presenter, “Effectively Employing Rule 23” (AAJ: 2020 Annual Convention, Virtual, 07/15/2020)
  • Presenter, “The ABCs of ESI” (National Employment Lawyers Association’s 2020 Virtual Annual Convention: Community, Learning, Excellence, 07/08/2020)
  • Presenter, “Rule 30(b)(6) Depositions in Class Action Litigation: Deposing or Defending Corporate Witness Depositions” (Global Cyber Institute and Thomson Reuters, Virtual, 06/11/2020)
  • Presenter, “Plenary 1: “Tips from the Trenches” (Women Owned Law Symposium on Women’s Entrepreneurship in Law, 03/11/2020)
  • Presenter, “Privacy & Data Breach Class Actions” (Western Alliance Bank: Class Action Law Forum 2020, 03/04/2020)
  • Presenter, “The Power of E-Discovery: Best Practices in the Tech Age” (American Association for Justice: Women’s Trial Lawyers Caucus Leadership Summit, 02/07/2020)
  • Presenter, “TAR & AI” (Georgetown Law CLE: 2019 Advanced e-Discovery Institute (“AEDI”), 11/22/2019)
  • Moderator, “Advancements in Cyber Security” (Tech Up for Women 2019 Conference, 11/19/2019)
  • Presenter, “Should We Build A Better Mousetrap? Privilege Logs – Part 1” (The Sedona Conference® WG1 Annual Meeting, 10/24/2019)
  • Presenter, “Handling e-Discovery in Complex Cases” (Global Cyber Institute and Thomson Reuters, 09/27/2019)
  • Presenter, “Technology Assisted Review” (Equal Employment Opportunity Commission, 08/14/2019)
  • Presenter, “Considerations When Negotiating ESI/Protective Orders” (AAJ Annual Convention, 07/29/2019)
  • Presenter, “2019: A Refined Approach to Discovery in Federal Practice” (National Association of Consumer Advocates, 06/13/2019)
  • Presenter, “What a Class Action Attorney Needs to Know to Negotiate an ESI Protocol” (360 Advocacy: Class Action Roundtable, 04/30/2019)
  • Teaching, “2019 E-Discovery Distinguished Speaker” (University of Florida Fredric G. Levin College of Law, 03/11/2019)
  • Presenter, “Cases Filed, Claims Advanced and Discovery” (HarrisMartin’s Marriott Data Breach Litigation Conference, 01/29/2019)
  • American Association for Justice, Member
  • American Bar Association, Member
  • American Bar Foundation, Life Fellow
  • Bloomberg Law Litigation Innovation Board, Member
  • ESchool4Girls, Inc., Mentor and Business Advisor
  • Fordham Law Small to Midsize Firm Leaders, Dean’s Advisory Council
  • Georgetown University Law Center’s Advanced e-Discovery Institute, Advisory Board Member and AEDI 2021 Improved Experience Committee
  • Mobilization for Justice, Board Member
    • 2020, 2021 Co-Chair of Annual Fundraising Event
  • National Association of Consumer Advocates, Working Member
  • National Consumer Law Center, Member
  • New York American Inns of Court, Emeritus Member
    • 2016-2019 Vice President
  • New York City Bar Association, Member
  • New York State Bar Association, Member
  • National Civil Justice Institute, Fellow
  • Public Justice, Supporting Member
  • The Sedona Conference®, Chair Emeritus of Working Group 1
    • 2013-2017 Board of Directors
    • 2008-2012 Past Chair of the Steering Committee for Working Group 1 on Electronic Document Retention and Production
  • Women Owned Law, Member and NY Steering Committee, Member
  • New York Regional Steering Committee, Member
  • New Jersey, 1992
  • New York, 1993
  • US. Court of Appeals
    • First Circuit, 2015
    • Second Circuit, 2010
    • Third Circuit, 1998
  • U.S. District Court
    • U.S. District Court, Southern District of New York, 1993
  • U.S. District Court, Eastern District of New York, 1993
  • U.S. District Court for the District of New Jersey, 1992