People / Andrew P. Van Osselaer
Van Osselaer Andrew

Andrew P. Van Osselaer

Andrew Van Osselaer is an insurance coverage and environmental litigator, who represents clients, including commercial policyholders, in coverage and environmental disputes arising out of their commercial and industrial operations. Because his clients’ disputes are often as complex and diverse as their operations, Andrew’s success has been in no small part due to his practiced skill in communicating complex, scientific concepts and his commitment to mastering the art of litigation in every battleground his clients find themselves—whether before a court, an agency, or an international arbitration tribunal.

Andrew was recognized as “One to Watch” by Best Lawyers in America, Woodward/White, Inc., in the areas of Commercial Litigation, Insurance Coverage, and Construction Litigation for 2023. He is a co-chair of the ABA Insurance Coverage Litigation Committee’s Environmental & Energy Subcommittee, and a member of the Robert W. Calvert Inn of Court. Before joining Haynes Boone, Andrew graduated from the University of Texas School of Law with High Honors, where he served as the Managing Editor of the Texas Law Review and was a member of the Chancellors and Order of the Coif honor societies. Prior to law school, Andrew worked in the music industry as an audio engineer and concert lighting designer.

Show More
Expand All
  • Represented chemical manufacturer against its insurers in the aftermath of a plant explosion, securing coverage for environmental enforcement actions, tort claims, first-party property and business interruption claims, cleanup costs, and an OSHA investigation.
  • Defended and obtained favorable cleanup agreement and deferred prosecution for a landowner in an enforcement action under Texas’s Water Code, Solid Waste Disposal Act, and Natural Resources Code arising out of a tenant’s waste-recycling operations.
  • Defended hazardous waste transporter in CERCLA lawsuit brought by PRP group, later representing same client against its recalcitrant insurer, obtaining defense and indemnity coverage for its losses associated with the Superfund site.
  • Represented product manufacturer against its insurers spanning a decade of primary and excess policies, securing defense and indemnity coverage for numerous asbestos-related lawsuits.
  • Defended design-builder in arbitration and bankruptcy adversary proceeding against allegations of over $100 million in design- and construction-related defects arising out of a public-private infrastructure project. 
  • Defended boutique and its owner against commercial landlord seeking to hold both liable for a sublessee’s breach, securing dismissal of all claims on summary judgment.
  • Represented apartment complex against its recalcitrant insurers, securing settlement covering client’s multi-million-dollar hail loss.
  • Co-chair, Environmental & Energy Subcommittee, ABA ICLC
  • Associate, Calvert Inn of Court
  • Included in the "Ones to Watch" category of Best Lawyers in America, Woodward/White, Inc., 2023
  • "PFAS Coverage: Government Enforcement and Cleanup," speaker, 2023 ICLC Conference
  • "PFAS Coverage: Government Enforcement and Cleanup," co-author, 2023 ICLC (2023)
  • "Mitigating Exposure to PFAS Liability," co-author, Mealey’s Pollution Liability Report, Vol. 35, #13, September 2022.
  • “Readying Companies for PFAS Regulation and Liability”, co-author, Law360, August 30, 2022.
  • "Lessons from the Ever Given for an Increasingly Turbulent Global Supply Chain," co-author, Global Trade, April 12, 2021.
  • "Superfund Ruling May Increase Landowners' Cleanup Liability," co-author, Law360, May 21, 2020.
  • "Who Will Pay for the Freeze and Subsequent Meltdown in Texas?" co-author, Insurance Journal, March 16, 2021.
  • "Renewable Energy Cos. Need New Risk Management Tools," co-author, Law360, March 3, 2021.
  • “Texas Environmental Law,” co-author, Volumes 45-46, Chapter 12 Storage Tanks, Chapter 34 Insurance, Thomson Reuters, 2020-2021.
  • “Insurance Coverage for Businesses’ COVID-19-Related Losses,” co-presenter, Austin Bar Association Remote CLE, April 15, 2020.
  • “Texas Environmental Law,” Volumes 45-46, co-author for chapters: PCBs, Medical Waste, Insurance, and Storage Tanks, Thomson Reuters, 2019-2022.
  • “Ethics and the Environmental Lawyer,” presenter, Texas Environmental Superconference’s Walking a Tightrope, July 31, 2019.
  • “Clean Water Act in 2019: What WOTUS and Maui Mean for Oil and Gas,” presenter, Tarrant County Bar Association Environmental Law Section Luncheon, April 25, 2019.
  • "Texas Rules of Form Companion Report," author, Texas Law Review, 2018.
  • "Texas Rules of Form," reporter, 14th ed., 2018.
  • "Insider Trading Enforcement & Link Prediction," author, 96 TEXAS L. REV. 399, 2017.


J.D., The University of Texas School of Law, 2018, with high honors; Chancellor; Order of the Coif; Managing Editor, Texas Law Review

B.A., University of Texas at Austin, 2015, with highest honors




Court Admissions

U.S. Court of Appeals for the Fifth Circuit

U.S. Court of Appeals for the Second Circuit

U.S. District Court for the Northern District of Texas

U.S. District Court for the Southern District of Texas

U.S. District Court for the Western District of Texas

U.S. District Court for the Eastern District of Texas

U.S. District Court for the District of Colorado

Press Release
5 Haynes Boone Lawyers Named Among Top Attorneys in Austin
August 02, 2021

Austin Monthly magazine has included the following Haynes and Boone, LLP lawyers in its 2021 listing of Austin’s Top Attorneys: Partners Leslie Thorne and Adam Sencenbaugh; Senior Counsel Jeff Civins; Counsel Mike Hatchell; and Associate Andrew Van Osselaer. Austin Monthly additionally named Hatchell and Civins as Legacy Award winners. “These attorneys represent the best of the best with more tha [...]