John Grinnan


John Grinnan's Headshot

John Grinnan has one goal: get the best possible result for plaintiffs. With aggressive and innovative advocacy strategies, he affirms the rights of his clients against some of the largest corporations in the nation. His cases often involve catastrophic injury and wrongful death, equipping him to handle the most complex and high-stakes cases.

“At Arnold & Itkin, being a trial lawyer isn’t just a job—it’s our passion. We’re 100% committed to doing whatever it takes to get the best possible results for our clients. No matter what.


As a trial lawyer, John Grinnan never backs down until his clients get the best results. He came to Arnold & Itkin in 2021 with nearly a decade of experience standing up to the world’s largest companies for individuals harmed by their negligence. His legal work focuses on wrongful death and catastrophic injuries.

John grew up in Dallas, where he attended Jesuit College Preparatory School. His undergraduate studies took him to Austin to study government at the University of Texas. He then continued his studies at the South Texas College of Law.

While in law school, John developed his passion for trial advocacy while participating in the school’s nationally-ranked moot court program. There, he was privileged to learn from the late Thomas Gerald Treece.

John’s academic performance earned two awards, including one for finishing with the highest grade in the school’s Advanced Products Liability Course. He was also included on the Dean’s List for four consecutive semesters.

John finished law school cum laude in the top 15 percent of his class. His graduating honors included admittance into the Order of the Lytae and an Academic Merit Scholarship.

John began trial work after being admitted to the State Bar of Texas. He spent nearly a decade taking on some of the largest companies to ensure they answered for harming regular people. This experience helped make John a great fit at Arnold & Itkin.

John can be found with his wife Sarah and his daughter Clare when he isn’t working. He also golfs and loves to support his favorite football, basketball, and baseball teams.

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