Photo of Laurence ("Lon") D. LeSueur, Jr.

Laurence ("Lon") D. LeSueur, Jr.

f: 504.589.9701


  • Law Clerk to the Honorable Judge Susie Morgan, United States District Court, Eastern District of Louisiana


Louisiana State University Paul M. Hebert Law Center, J.D., magna cum laude, 2013

University of Mary Washington, B.S., B.A., 2010


Benchmark Litigation, 40 & Under List, 2022, 2023

The Best Lawyers in America, 2024; Best Lawyers, Ones to Watch, 2021, 2022

Louisiana Super LawyersRising Star, 2022, 2023

New Orleans CityBusiness,
Ones to Watch: Law, 2020

Louisiana Law Review, Senior Associate

Order of the Coif

Bar Admissions

  • Louisiana

Lon LeSueur’s multi-faceted practice focuses on complex and commercial litigation. He has deep litigation experience, having earned victories for his clients in state and federal courts in Texas, Louisiana, and Mississippi, as well as various arbitration forums. Lon has successfully represented clients through all stages of litigation from case development and initial fillings, motion practice, discovery, trial, and appeal. Lon’s recent appellate experience includes three victories at the United States Fifth Circuit Court of Appeals, including two reversals. 

Substantively, Lon’s practice includes representing whistleblowers in high-stakes False Claim Act (FCA) litigation involving healthcare fraud across the country, and he helps author the seminal FCA healthcare treatise—Health Care Fraud: Enforcement and Compliance. Lon has also litigated class actions, shareholder derivative claims, intellectual property actions, contract disputes, securities claims, as well as products liability and environmental/toxic tort matters.  And Lon maintains a strong insurance coverage practice, representing carriers in high-stakes bad faith cases.

Before joining the firm, Lon served as a law clerk to the Honorable Susie Morgan of the United States District Court for the Eastern District of Louisiana. He received his Juris Doctor magna cum laude from the Paul M. Hebert Law Center at Louisiana State University.  While at LSU Law, Lon served as a Senior Associate of the Louisiana Law Review.

Louisiana Super Lawyers - Rising Stars - Laurence ("Lon") D. LeSueur, Jr.

Notable Representations
  • Successfully represented insurance company in $40+ million coverage dispute arising out of failed hospital pension fund; obtained reversal by U.S. Fifth Circuit Court of unfavorable district court ruling.
  • Successfully represented insurer in coverage dispute; obtained reversal with U.S. Fifth Circuit resulting in judgment entitling insurer to reimbursement of $1 million.
  • Successfully obtained summary judgment in favor of oil and gas transmission company in property damage litigation; U.S. Fifth Circuit Court of Appeals affirmed the ruling.
  • Representing directors of Fortune 500 Company in internal investigation and derivative lawsuits that are part of Multi-District Litigation (MDL).
  • Successfully represented television production company in commercial dispute, obtaining dismissal of claims for defamation, trespass, breach of contract, disgorgement of profits, unfair trade practices, punitive damages, and attorneys’ fees.
  • Successful representation of foreign shipbuilder, obtaining dismissal of claims for antitrust violations and breach of contract.
  • Member of trial team defending major refining company against numerous personal injury claims arising out of oil spill.   
  • Defended insurance companies in various coverage disputes arising out of commercial disputes, pollution events, property damage, and personal injuries.
  • Conducted internal investigation of $800 million, privately-held Louisiana company regarding alleged fraud and corporate waste.
  • Defended construction payment platform software company against claims for copyright infringement, unfair trade practices, fraud and breach of contract.
  • Defended restaurant group against claims for misappropriation of trade secrets, breach of contract, and unfair trade practices.
  • Represented juvenile in Special Immigration Juvenile Status (SJIS) proceedings.
  • Representing indigent criminal defendant in state post-conviction relief proceedings.  
Professional and Civic Activities

In addition to his practice, Lon is also active in professional and community organizations. He is a member of the Louisiana State Bar Association and the New Orleans Bar Association, and served as a Junior Member of the Louisiana State Law Institute.