John Grinnan

Proven Verdicts
Attorney at Arnold & Itkin
Houston, TX12 years experienceAdmitted 2013

About John Grinnan

John Grinnan is a trial attorney at Arnold & Itkin LLP in Houston, focused on wrongful death and catastrophic injury cases. He grew up in Dallas, studied government at The University of Texas at Austin, and earned his JD cum laude from South Texas College of Law, graduating in the top 15% of his class. Before joining Arnold & Itkin in 2021, he practiced at Clark, Love & Hutson; Abraham, Watkins, Nichols, Sorrels, Agosto & Friend; and Perdue Kidd & Vickery, building nearly a decade of experience in pharmaceutical product liability and personal injury litigation. He helped secure a $185 million settlement for seamen injured during a severe weather event.

Proven verdicts and settlements

$557 millionVerdict

A Harris County jury awarded Mary Johnson $557 million against Union Pacific for a 2016 Houston train strike that cost her a leg, several fingers, and left her with a brain injury, a figure the trial court later cut and an appeals court reversed for a new trial.

Harris County District Court, Houston, TX · 2023Car AccidentsRead the full story →
$6.45 millionVerdictTop 20 in Louisiana · #20

Walter Jackson, 48, was a rigger on an offshore platform 65 miles south of Lake Charles. The crew was lowering sections of corroded firewater pipe when the manila rope holding a 131-pound section broke. He was standing in a landing zone nobody had cleared, and it killed him instantly.

U.S. District Court, Western District of Louisiana (Lake Charles) · 2025Wrongful DeathRead the full story →

Prior results do not guarantee a similar outcome. Each case is unique and depends on its own facts.

Practice areas

Education

South Texas College of Law
J.D. cum laude; B.A. Government, 2013
The University of Texas at Austin
Undergraduate

Bar admissions & credentials

State Bar of Texas, admitted 2013
State Bar of Texas

Awards & recognition

Order of the Lytae
Academic Merit Scholarship
Dean's List (four consecutive semesters)
Highest grade, Advanced Products Liability

Other attorneys at Arnold & Itkin

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Proven verdicts and settlements from other Houston firms

The Lanier Law Firm
The Lanier Law Firm
$4.85 Billion Vioxx MDL Settlement for Heart-Attack and Stroke Victims
The Buzbee Law Firm
The Buzbee Law Firm
$1.1 Billion Verdict for Child Left Brain-Damaged by Oil-Fortune Heir
Williams Hart & Boundas
Williams Hart & Boundas
$15.3 billion · Texas Recovers $15.3 Billion From Tobacco Industry in Landmark 1998 Settlement
The Ammons Law Firm LLP
The Ammons Law Firm LLP
$812 Million Verdict for Family of Worker Killed in Pecos Chemical Plant Explosion, Part of $1.6 Billion
Abraham Watkins
Abraham Watkins
$28.59 million · Jury Finds ExxonMobil 100% Liable for Baytown Plant Explosion, Awards Five Workers $28.59 Million

Prior results do not guarantee a similar outcome. Each case is unique and depends on its own facts.