Mary Lou Flynn-DuPart
Practice Areas
Experience
- Business Litigation
- Construction Litigation
- Copyrights
- Intellectual Property Litigation
- Product Liability
- Technology
Biography
Mary Lou Flynn-DuPart is a Houston based litigation and intellectual property attorney who focuses on trying cases as well as assisting clients with navigating the changing landscape of electronic discovery in complex commercial and intellectual property litigation. She has been performing as first chair trial counsel for her clients since 1986.
Mary Lou assists as a member of a cohesive litigation team, the core of which has worked together for over eight years, bringing efficiency and maximum results from electronic data retention, collection, review and production using online databases, and the management, review, and use of electronic information in complex business litigation and intellectual property cases.
Education
B.S., summa cum laude, University of Houston
J.D., cum laude, South Texas College of Law Houston
- Assistant Technical Editor, South Texas Law Journal
Bar Admissions
Texas
Court Admissions
United States Court of Appeals for the Fifth Circuit
United States District Court for the Northern, Southern, Eastern and Western Districts of Texas
United States District Court for the Western District of Oklahoma
- Michael Slagle v. Farmers Insurance Exchange, et al (Harris County 270th 2013) Mary Lou obtained a summary judgement on behalf of Farmers in a whistleblower claim
- D Design Holdings, L.P. v. Lionstone Urban Investments Two, LP, et al (Dallas County, 93rd 2010) Mary Lou successfully defended Lionstone, the purchaser of commercial real-estate, against claims by D Design Holdings, the seller, that they were entitled to post closing payment made by an anchor tenant. A jury found in favor or Lionstone and awarded attorney’s fees for Defendant.
- Sendo v. Microsoft Corporation – (E.D. Tex. 2002-2004). Mary Lou was involved the collection, production, and review of millions of pages of documents in this case alleging breach of contract and theft of trade secrets involving the development of a smart phone. The case settled favorably prior to trial.
- Nelkin v. R&L Trucking – (Harris County, 190th 2001) Mary Lou was lead trial counsel in a truck accident that left a 16-year-old girl with permanent brain damage. Plaintiff’s first witness caused a mistrial. After talking to the jury the case was re-mediated and settled on terms favorable to the defendant.
- Howland v. Tyler Pipe – (Smith County Court at Law 2000) Presiding Judge Thomas A. Dunn (concurrent jurisdiction with District Courts). Mary Lou and Richard Griffin were trial counsel for Swan Transportation, the parent company of Tyler Pipe, in a suit by former employees of Tyler Pipe suffering from alleged asbestosis and asbestos-related cancers. The legal defense of joint venture was on appeal when all of the asbestos cases against Swan Transportation settled.
- The Best Lawyers in America (Woodward/White Inc.), Commercial Litigation, 2024-2025
- AV Preeminent, Martindale-Hubbell
- Gulf Coast Center – Brazoria and Galveston Counties, Board Member
- Texas Council Risk Management Fund – Statewide Pool for Community Centers, Board Chair
- Tri-County Behavioral Healthcare – Montgomery, Liberty, and Walker Counties, Board Attorney
March 24, 2025
Spotlight
Jackson Walker Shortlisted for Managing IP’s Firm of the Year Awards for Patent and Trademark Disputes
Jackson Walker is honored to be shortlisted for the 2025 Managing IP Awards in the U.S. Regional Categories, including “Firm of the Year” for Patent and Trademark Disputes in the South!
December 16, 2024
Newsletters
JW Belonging & Inclusion Newsletter – December 2024
View Jackson Walker’s December 2024 Belonging & Inclusion Newsletter, Perspectives.
August 15, 2024
Attorney News
‘The Best Lawyers in America’ Features 306 Jackson Walker Attorneys in 2025 Edition, Including 9 “Lawyers of the Year” and 75 “Ones to Watch”
The Best Lawyers in America has recognized 306 Jackson Walker attorneys across 81 specialty practice areas in its 2025 edition, including 9 Lawyers of the Year and 75 Ones to Watch. In this year’s guide, Jackson Walker saw the largest number of attorneys in the areas of Commercial Litigation (75 attorneys) and Real Estate Law (55 attorneys) and the addition of 27 attorneys as Best Lawyers.
August 17, 2023
Attorney News
‘The Best Lawyers in America’ Honors 287 Jackson Walker Attorneys in 2024 Edition, Including 12 “Lawyers of the Year” and 80 “Ones to Watch”
The Best Lawyers in America has recognized 287 Jackson Walker attorneys across 5 offices and 82 specialty practice areas in its 2024 edition, including 12 Lawyers of the Year and 80 Ones to Watch. In this year’s guide, Jackson Walker saw the largest number of attorneys in the areas of Commercial Litigation (66 attorneys) and Real Estate Law (60 attorneys) and the addition of 35 attorneys as Best Lawyers.
December 23, 2014
Attorney News
Mary Lou Flynn-DuPart Quoted in “Texas Lawbook” on Client-Focused Holiday Events
A Texas Lawbook article featured Mary Lou Flynn-DuPart discussing family-friendly holiday parties hosted by Texas law firms.
August 13, 2014
Attorney News
Mary Lou Flynn-DuPart Speaks at General Counsel Institute’s Discovery Program Series
Jackson Walker partner Mary Lou Flynn–DuPart will speak at “The Exchange” Houston, an interactive corporate e–discovery program series hosted by Today’s General Counsel Institute.
February 9, 2004
Attorney News
Jackson Walker Announces the Election of Seven New Partners
Jackson Walker announces that the following attorneys have been elected as partners: Alexandre Bourgeois, Ray Charles Clark, Mary Lou Flynn-DuPart, W. Ross Forbes, Jr., Jeffrey G. Hamilton, James D. Prappas, and Mark Walters.
Practice Experience
- Michael Slagle v. Farmers Insurance Exchange, et al (Harris County 270th 2013) Mary Lou obtained a summary judgement on behalf of Farmers in a whistleblower claim
- D Design Holdings, L.P. v. Lionstone Urban Investments Two, LP, et al (Dallas County, 93rd 2010) Mary Lou successfully defended Lionstone, the purchaser of commercial real-estate, against claims by D Design Holdings, the seller, that they were entitled to post closing payment made by an anchor tenant. A jury found in favor or Lionstone and awarded attorney’s fees for Defendant.
- Sendo v. Microsoft Corporation – (E.D. Tex. 2002-2004). Mary Lou was involved the collection, production, and review of millions of pages of documents in this case alleging breach of contract and theft of trade secrets involving the development of a smart phone. The case settled favorably prior to trial.
- Nelkin v. R&L Trucking – (Harris County, 190th 2001) Mary Lou was lead trial counsel in a truck accident that left a 16-year-old girl with permanent brain damage. Plaintiff’s first witness caused a mistrial. After talking to the jury the case was re-mediated and settled on terms favorable to the defendant.
- Howland v. Tyler Pipe – (Smith County Court at Law 2000) Presiding Judge Thomas A. Dunn (concurrent jurisdiction with District Courts). Mary Lou and Richard Griffin were trial counsel for Swan Transportation, the parent company of Tyler Pipe, in a suit by former employees of Tyler Pipe suffering from alleged asbestosis and asbestos-related cancers. The legal defense of joint venture was on appeal when all of the asbestos cases against Swan Transportation settled.
Recognition & Accolades
- The Best Lawyers in America (Woodward/White Inc.), Commercial Litigation, 2024-2025
- AV Preeminent, Martindale-Hubbell
Community Involvement
- Gulf Coast Center – Brazoria and Galveston Counties, Board Member
- Texas Council Risk Management Fund – Statewide Pool for Community Centers, Board Chair
- Tri-County Behavioral Healthcare – Montgomery, Liberty, and Walker Counties, Board Attorney