Attorney Photo
PDF Long
PDF Short

Cathleen W. McMahon Associate

T 918-594-0672 | F 918-594-0505 | Cell 918-645-7763 |

Download V-Card

Cathleen McMahon focuses her practice in the civil litigation arena, specifically in Cannabis, Insurance Defense and Professional Liability law. She has extensive practice defending matters concerning medical malpractice, premise liability, professional liability, personal injury, insurance bad faith and commercial disputes.

When not working, Cathleen enjoys reading, traveling and spending time with her husband, Cal, and two children, Georgiana and Theodore.


  • University of Tulsa College of Law (J.D., 2015)
  • University of Oklahoma (B.S. in Medical Ethics, 2012)
    • Minor, Psychology


  • Oklahoma
  • U.S. District Court for the Eastern, Western and Northern Districts of Oklahoma
Legal Experience
  • 2021-Present Hall Estill
  • 2020-2021 Pierce, Couch, Hendrickson, Baysinger & Green
  • 2018-2020 Steidley & Neal
  • 2016-2018 Atkinson Haskins Nellis Brittingham Glass & Fiasco
  • 2016 Baum, Glass and Jayne
Published Articles
  • Co-Author, You're Cancelled: A Litigation Primer on Cancel Culture and Jury Bias, USLAW Magazine, March 2021
Professional Involvement
  • Member, Tulsa County Bar Association
  • Member, Oklahoma Bar Association
  • Member, Oklahoma Association of Defense Counsel
  • Member, Defense Research Institute
Community Involvement
  • Member, Young Professional's Board of Directors, Emergency Infant Services of Tulsa
  • Volunteer Mentor to law students at the University of Tulsa College of Law
  • Volunteer guest speaker at the University of Tulsa College of Law