Jennifer O'Sullivan


  • Jennifer O'Sullivan
  • Phone: +1 415 957 3086

    Import to Address Book

  • Duane Morris LLP
    Spear Tower
    One Market Plaza, Suite 2200
    San Francisco, CA 94105-1127

Jennifer O’Sullivan practices in the area of employment and labor law. Ms. O’Sullivan also has experience in complex products liability, toxic tort and commercial litigation.

Ms. O’Sullivan is a 1984 graduate of the University of California, Hastings College of the Law and a graduate of the University of California, Berkeley.

Areas of Practice

  • Employment and Labor Law

Representative Matters

  • Served on successful trial team in the defense of public school district in trial of wrongful termination action based on racial discrimination.
  • Obtained summary judgment in multiple lawsuits on behalf of licensor of automotive parts brand from plaintiffs alleging asbestos exposure from friction products.
  • Obtained summary judgment on behalf of major petrochemical company against claim of premises liability.
  • Obtained summary judgment on behalf of defense contractor in products liability action.
  • Represented manufacturers and distributors of consumer products in the defense of California Proposition 65 claims involving alleged exposure to lead and phthalates.
  • Represented municipalities in personal injury actions alleging unsafe conditions on public property.
  • Represented major chemical company against claims of ground water contamination resulting from the use of pesticides.
  • Served on winning trial team on behalf of oil refining company in action involving claim of exposure from toxic fumes emanating from refinery.
  • Represented oil refining company in a benzene-related personal injury action brought by employee of contractor performing work at client’s refinery.
  • Defend third party benefits administrator in ERISA disputes.
  • Represent private employers in breach of contract actions and other business disputes.
  • Obtained voluntary no-pay dismissals for a pharmaceutical distributor after filing summary judgment motions establishing that our client’s over-the-counter talcum powder was not contaminated with asbestos and that the plaintiffs’ personal injury claims were preempted by the Federal Food, Drug and Cosmetics Act.


  • California


  • University of California College of the Law, San Francisco, J.D., 1984
  • University of California, Berkeley, B.A., 1981


  • Duane Morris LLP
    - Associate, 2018-present

  • Sedgwick LLP
    - Associate, 2013-2017

  • Brown, Eassa & McLeod LLP
    - Counsel, 2011-2013

  • Filice, Brown, Eassa & McLeod LLP
    - Associate, 1999-2011

  • Hardin, Cook, Loper, Engel & Bergez
    - Associate, 1990-1999

  • Jedeikin, Green, Sprague and Bishop
    - Associate, 1985-1990

Selected Speaking Engagements

  • Speaker, "Best Practices for Protecting Your Business from Class and Collective Actions and Unfair Competition," The New Reality of Workplace Law and Practice in the COVID-19 Era, Duane Morris LLP, Webinar, October 28, 2020