A.J. De Bartolomeo

Attorney Profile

Top Rated Class Action & Mass Torts Attorney in Oakland, CA

Tadler Law, LLP
 | 505 14th Street, Suite 1110
Oakland, CA 94612
Phone: 212-651-6879
Selected To Super Lawyers: 2013 - 2021
Licensed Since: 1988
Practice Areas:
  • Class Action/Mass Torts: Plaintiff (40%),
  • Antitrust Litigation (40%),
  • Consumer Law (20%)
    Attorney Profile

    Known nationally as a zealous advocate for clients, A.J. de Bartolomeo handles class action, mass torts, consumer law and antitrust cases. She is a shareholder at Tadler Law, LLP, where she works with clients in and around New York City, New York.

    Ms. de Bartolomeo has earned an exemplary reputation for her work. Beyond the representation she does for her clients, numerous courts have appointed her as a plaintiff's steering committee member or lead or co-lead counsel. She has also earned a number of awards, including receiving the highest peer rating possible of AV Preeminent* from Martindale-Hubbell and being selected for inclusion in the Super Lawyers list. The American Association of Justice has also presented her with its Above and Beyond Award.

    Accolades aside, what matters most to Ms. de Bartolomeo is reaching her clients' goals. She strives for excellence in everything she does, from communicating with the people she represents, to crafting individualized strategies on their behalf, to making compelling arguments in the courtroom.

    In 1982, Ms. de Bartolomeo graduated with a Bachelor of Arts from Fairfield University. She then earned a Juris Doctor from the University of California Hastings College of Law in 1988. Ms. de Bartolomeo also holds a general course certification in economics from the London School of Economics.

    Ms. de Bartolomeo is admitted to practice before the Supreme Court of the United States as well as a number of other federal and state courts across the country. She is a member of the American Bar Association and the American Association for Justice.

    Outside her practice, Ms. de Bartolomeo is passionate about helping other women lawyers advance.

    * AV®, AV Preeminent®, Martindale-Hubbell Distinguished and Martindale-Hubbell Notable are certification marks used under license in accordance with the Martindale-Hubbell certification procedures, standards and policies. Martindale-Hubbell® is the facilitator of a peer review rating process. Ratings reflect the anonymous opinions of members of the bar and the judiciary. Martindale-Hubbell® Peer Review Rating™ fall into two categories – legal ability and general ethical standards.

    Practice Areas
    • 40%Class Action/Mass Torts: Plaintiff
    • 40%Antitrust Litigation
    • 20%Consumer Law
    Focus Areas

    Class Actions, Antitrust & Trade Litigation, Consumer Protection


    Selected to Super Lawyers for 9 yearsbottom-image

    Super Lawyers: 2013 - 2021

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    About AJ De Bartolomeo

    Admitted: 1988, California

    Professional Webpage: https://www.tadlerlaw.com/profile/a-j-de-bartolomeo/


    • Top Lawyers in America in the 2020 U.S. News & World Report Best Lawyers (2020)
    • Top 50 Women Lawyers in Northern California (2017)
    • Distinguished Service Award, American Association for Justice (2016)
    • Above and Beyond Award, American Association for Justice (2018)
    • Martindale Hubbell AV® Preeminent ™ Peer Review Rated for outstanding achievement
    • Top Women Attorneys in Northern California (2014)
    • Northern California Super Lawyer (2013-2020)

    Bar/Professional Activity:

    • U.S. District Courts Eastern District of Michigan, October 1994 
    • U.S. District Courts Eastern District of Wisconsin, February 2010
    • U.S. District Courts Southern and Central Districts of California, December 1995
    • U.S. District Courts Southern District of Texas, December 1993
    • U.S. Court of Appeals Sixth Circuit, August 2008 
    • U.S. District Courts Eastern District of California, December 1993 
    • U.S. District Courts Northern District of California, December 1988 
    • U.S. Court of Appeals Ninth Circuit, December 1988 
    • U.S. Court of Appeals Fifth Circuit, January 2004 
    • U.S. Court of Appeals Third Circuit, January 2018 
    • U.S. Court of Appeals Second Circuit, June 2006 
    • U.S. Court of Appeals First Circuit, October 2003 
    • U.S. Supreme Court, February 2001 
    • State Bar of California, December 1988 

    Scholarly Lectures/Writings:

    • Presenter, "Litigating Class Actions in Bankruptcy Courts, A General Motors Experience" (American Association for Justice, Women Trial Lawyers’ Caucus Wash. D.C. Lobby Days Seminar, May 2011)
    • Presenter, "Prepared for the Fact-finding Mission on Class Actions in the United States" (Kyoto Bar Association and Japan Federation of Bar Associations Symposium, June 2010)
    • Presenter, "Best Practices on Banking and Internal Compliance in Law Firm Management" (American Association for Justice, Women’s Leadership Summit, May 2010)
    • Presenter, "Volkswagen Emissions Class Action Status" (American Association for Justice: Plaintiffs’ Hot Topics and Trends in Litigation, December 2015)
    • Presenter, "Case Studies on Best Practices in Qualified Settlement Funds" (Bridgeport CLE Program, March 2012)
    • Presenter, "Ethical Best Practices in Client and Case Management" (American Association for Justice, Women Trial Lawyers’ Caucus Symposium, July 2013)
    • Presenter, "Suggested Best Practices for Compliance Training and Audit Procedures" (New York Stock Exchange listed Company, Legal and Compliance Departments, March 2014)
    • Presenter, "Litigation and Regulatory Risk Management in the Personal Care Products Industry" (New York Stock Exchange listed Company, Executive Session and General Counsel Legal Department, July 2014)
    • Presenter, "Mass Torts in MDLs" (MCM Services Group: Mass Tort Conference, April 2015)
    • Presenter, "Class Treatment: Can These Claims be Resolved as a Class Action?" (American Association for Justice: Opioid Litigation Seminar, September 2017)
    • Presenter, "Mass Tort Claims, Daubert Challenges and Causation Issues" (25th Annual Spring CLE Meeting for the American Bar Association Tort Trial and Insurance Practice Section (TIPS) Toxic Torts and Environmental Law Committee, April 2016)
    • Presenter, "Combatting the Latest Defense Tactics in Mass Torts/ Plaintiff Practice (Spoliation and Rule 37)" (Consumer Attorneys of California Sonoma Travel Seminar, April 2016)
    • Presenter, "Plastic in the Pelvis: Essure and Mesh Litigation" (Harris Martin: Women’s Health Litigation Conference, June 2016)
    • Presenter, "Best Practices for Class Action Notice and Settlement Administration" (Harris Martin: Class Actions, July 2016)
    • Presenter, "MDL Steering Committee Appointments; Structure and Leadership; What’s the Plan B" (Louisiana Bar Association: 16th Annual Class Action and Complex Litigation Symposium, November 2016)
    • Presenter, "Pharmaceutical Litigation: Business Implications for Unions and Their Members" (National Labor and Management Conference, February 2017)
    • Presenter, "Are You Going to Eat That? Issues, Hurdles and Opportunities in Food and Supplement Litigation" (26th Annual Spring CLE Meeting for the American Bar Association Tort and Insurance Practice Section (TIPS), Toxic Torts and Environmental Law Committee, April 2017)
    • Presenter, "Mass Torts and MDLs" (Class Action Law Forum, March 2020)
    • Presenter, "Theories for Presenting Class Actions in the Opioid Litigation" (Harris Martin: Opioid Conference, March 2018)
    • Presenter, "Current Class Action Landscape in Opioids Multidistrict Litigation" (HB Litigation: Opioid Crisis – Claims, Damages & Science, January 2018)
    • Presenter, "Best Practices for Communications with Class Representatives and Putative Class Members" (HB Litigation: Class Action Mastery, May 2018)
    • Presenter, "Current Defense Tactics to Challenge Class Representatives and Class Counsel" (Consumer Attorneys of California: Class Actions and Mass Torts, June 2018)
    • Presenter, "MDL Panel: How Do We Identify and Encourage Effective Case Management?" (The Rand Corporation, March 2019)
    • Presenter, "Federal Rule 23 Changes and Impact on Class Settlements" (Harris Martin Conference, January 2019)
    • Presenter, "Litigating MDLs from A to Z" (Harris Martin Conference, July 2019)
    • Team Co-Captain, "Brainstorming Group on the Need for Guidance and Uniformity in Filing ESI Under Seal" (Sedona Conference, September/October 2019)
    • Moderator and Facilitator, "Consumer Attorneys of California Annual Conference" (FAQs about Class Actions, November 2019)
    • Co-Presenter, "The Power of E-Discovery: Best Practices in the Tech Age" (Leadership Summit by Women’s Trial Lawyer Caucus, American Association for Justice, February 2020)


    • Lead Counsel – Powers Law Offices v. Cable & Wireless, USA, Case No. 99-CV-12007-EFH (D. Mass.)
    • Second Chair to Lead Counsel – Mitchell v. American Fair Credit Association, Case No. 785811-2 (Cal. Super. Ct. Alameda County); Mitchell v. Bankfirst, N.A., Case No. C-97-1421-MMC (N.D. Cal.)
    • Co-Lead Counsel – In re America Online, Inc. Version 5.0 Software Litigation, MDL No. 1341 (S.D. Fla.)
    • Second Chair to Co-Lead – In re MCI Non-Subscriber Telephone Rates Litigation, MDL No. 1275 (S.D. Ill.)
    • Lead Counsel – In re Cosmo Store Services, Case No. 8:08-bk-13110-RK (U.S.Bk. Ct., C.D.Ca.)
    • Second Chair to Co-Lead – In re PayPal Litigation, Case No. C-02-1227-JF (PVT) (N.D.Cal., S.J. Div. 2002)
    • Lead Counsel – Lehman v. Blue Shield, Case No. CGC-03-419349 (Cal. Super. Ct. San Francisco County)
    • Lead Counsel – Telstar v. MCI, Inc., Case No. 05 Civ. 10671-JGK (S.D.N.Y.)
    • Co-Lead Counsel – CalSTRS v. Qwest Communications, et al., Case No. 415546 (Cal. Super. Ct. San Francisco County)
    • Second Chair to Co-Lead – In re American Express Financial Advisors Securities Litigation, Case No. 04-cv-01773-DAB (S.D.N.Y.)
    • Appointed by Co-Lead Counsel to the Discovery and Law and Briefing Committees – In re Medtronic, Inc. Implantable Defibrillators Product Liability Litigation, MDL No. 05-1726 (D. Minn.)
    • Lead Counsel – In re Girls Gone Wild Consumer Fraud Litigation, Cal. Superior Court, Los Angeles (2010-2014)
    • Co-Lead Counsel – In re Literary Works in Electronic Database Copyright Litigation, MDL No. 1379 (S.D.N.Y.) (2001-Present)
    • Lead Counsel – In re Motors Liquidation Company, et al., f/k/a General Motors Corp., et al. (Bankruptcy Litigation), Case No. 09-50026 (U.S. Bk. Ct., S.D.N.Y.) (2009-2015)
    • Court-Appointed to the Plaintiffs Steering Committee – In Re TVM Pelvic Repair System Products Liability Litigation, (C.R. Bard, American Medical Systems, Boston Scientific, Ethicon, and Coloplast) MDL Nos. 2187, 2325, 2326, 2327, and 2387, (S.D. W. Va.) (2012-2013)
    • Co-Lead Counsel – Fitbit Cases, Special Title (Rule 3.550) Coordinated Proceeding, JCCP 4880 (Superior Court, County of San Diego) (2014-2017)
    • Acting Firm Member on Plaintiffs Steering Committee – In re Avandia Marketing, Sales Practices and Products Liability Litigation, MDL No. 1871, Case No. 07-MD-1871 (2016-present)
    • Court-Appointed to the Plaintiffs Steering Committee and served on the Daubert briefing committee – In re Pradaxa (Dabigatran Etexilate) Products Liability Litigation, Case No. 3:12-md-02385-DRH-SCW, MDL No. 2385 (S.D. Ill.) (2012-2017)
    • Court-Appointed to the Plaintiffs Steering Committee and served on the Legal Briefing Committee – In re Actos (Pioglitazone-Products Liability Litigation, MDL No. 6:11-md-2299 (W.D. La.) (2011-2016)
    • Court-Appointed to the Plaintiffs’ Executive Committee – In re Glumetza Antitrust Litigation, Case No. 3:19-cv-05822 WHA (2019-present)
    • Court-Appointed to the Plaintiffs Steering Committee and Co-Chair of the Plaintiffs’ Law and Briefing Committee and Daubert briefing team – In re Yasmin and Yaz (Drospirenone) Marketing, Sales Practices and Products Liability Litigation, Case No. 3:09-md-02100-DRH-CJP, MDL No. 2385 (S.D. Ill.) (2009-2018)
    • Co-Lead Counsel – Hope Solo v. United States Soccer Federation, No. 18-cv-05215-JD (2019-present)

    Educational Background:

    • London School of Economics, General Course Certificate in Economics – 1981
    • Fairfield University, B.A. – 1982

    Industry Groups

    • American Association For Justice - Women's Caucus
    • American Bankruptcy Institute
    • American Bar Association Sections On Litigation And Antitrust Law
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    Office Location for A.J. De Bartolomeo

    505 14th Street
    Suite 1110
    Oakland, CA 94612

    Phone: 212-651-6879

    A.J. De Bartolomeo:

    Last Updated: 12/27/2020

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