Jacob D. Diesselhorst

Jacob D. Diesselhorst Background

Jacob is passionate about representing the victims and survivors of catastrophic injury and wrongful death in Oklahoma. As one of the most respected and highly-regarded trial attorneys in Oklahoma, Jacob makes a point to develop a close relationship with each client built on trust, respect, and mutual admiration.

Jacob was born in Peoria, Illinois. He and his brothers were All-State Basketball players at Fairview during their time at the school and led their teams to multiple state tournaments and individual awards.

Jacob is married to Tressa Diesselhorst, his college sweetheart from OSU. They have three children, who are the pride and joy of Jacob’s life.

Jacob is also a huge sports fan and a proud supporter of the Oklahoma City Thunder, Oklahoma City Energy,  OSU and OU Athletics. In his free time, Jacob enjoys playing golf, spending time with his family, and traveling.


Jacob graduated in the top 5 of his class from Fairview High School in rural Northwest Oklahoma in 1994. From Fairview, Jacob continued his education at Oklahoma State University where he was a pre-law major.  He graduated with honors with a B.A. in Political Science and a Minor in Business in May 1999. Then he pursued his Juris Doctorate from the University of Oklahoma College Law and graduated with honors in 2002. 

University of Oklahoma College of Law

Norman, Oklahoma J. D. 2002

Oklahoma State University

Stillwater, Oklahoma, B.A. 1999
Political Science Major
Business Minor

Areas of Practice

Jacob focuses his practice on representing the victims of birth injury and birth trauma. Jacob has obtained numerous multi-million-dollar settlements for injured children and their families across Oklahoma. Settlements can make a huge difference in improving the quality of life for these permanently injured children. The types of birth injuries Jacob’s practice focuses on are: 

•   Hypoxic Ischemic Encephalopathy (HIE)
•   Cerebral Palsy (CP)
•   Periventricular Leukomalacia (PVL)
•.  Birth Trauma
•.  Hypoxic (lack of oxygen) Brain Damage
•   Seizure Disorder
•   Brachial Plexus Injuries/Erbs Palsy
•   Brain and Spinal Cord Injury
•   Permanent Neurological Injuries


Birth Injuries

Medical Malpractice & Medical Error/Neglect

Catastrophic Personal Injury

Wrongful Death Cases

Corporate Negligence

Serious Trucking Accidents

Serious Motor Vehicle Accidents

Hospital Negligence

Play Video

Representative Verdicts & Settlements

Professional Associations & Memberships

American Association for Justice (AAJ) Birth Trauma Litigation Section

American Association for Justice (AAJ)

Oklahoma Association for Justice (OAJ)

Oklahoma Association for Justice Advisory Board, Legislative Committee, and Executive Board

American Association for Justice, Leaders Forum, Member

Bar Admissions

Oklahoma, 2002

New Jersey, 2008

U.S. District Court Eastern District of Oklahoma

U.S. District Court Northern District of Oklahoma

U.S. District Court Western District of Oklahoma 10th Circuit

Honors & Awards

Top 100 Verdicts in Personal Injury in the United States 2020

405 Best Attorney for Plaintiff’s Medical Malpractice 

Super Lawyer Rising Star 2011, 2012, 2013

Super Lawyers 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 (13 consecutive years)

Top Attorney in Oklahoma Award, Oklahoma 2017, 2016, 2021

National Association of Distinguished Counsel Top One Percent 2015

Leadership in Law Award, Journal Record, 2011

Tom Wallace Award, Oklahoma Association for Justice, 2008

The National Trial Lawyers Top 100

Keynote Speaking

American Conference Institute 20th Annual Advanced Forum on Obstetric Malpractice Claims: Understanding the Controversy Around HIE and Cooling—Debating the Pros and Cons

Published Opinions

Andrew v Depani-Sparkes, 2017 OK 42, 396 P.3d 210

Published Works & Articles

The Result, Episode #22: Jacob Diesselhorst & Glendell Nix by Preferred Capital Funding (2021, March 24)