Attorney Profile | Cullen McMahon

Cullen Mcmahon with glasses wearing a suit and green tie, smiling at the camera. Dark background.

Attorney Cullen McMahon is a co-founder and owner of McMahon Dean PLLC in Dallas, Texas. A top-rated trial attorney with 20 years of experience, Mr. McMahon devotes his practice exclusively to helping his clients recover the maximum amount of compensation for injuries and losses they have sustained as a result of someone else's negligence or wrongdoing.


Serving clients throughout the Greater Dallas-Fort Worth Metroplex and all across Texas and Oklahoma, Mr. McMahon has achieved unprecedented success advocating on behalf of those in need by handling all types of serious injury and wrongful death claims resulting from preventable or avoidable accidents.


A 2002 graduate of The University of Texas at Austin, Mr. McMahon attended Oklahoma City University School of Law, where he obtained his Juris Doctor in December 2005. He received his license to practice from the Oklahoma Bar Association in April 2006 and from the State Bar of Texas in December 2011.  He is licensed to practice before all U.S. District Courts in Texas and Oklahoma, as well as the Supreme Court of Texas and the Supreme Court of Oklahoma.


Highly active in his legal community, Mr. McMahon is a member of the Dallas Trial Lawyers Association, the Texas Trial Lawyers Association, and the American Association for Justice.  He serves on the board of directors for the Texas Trial Lawyers Association and is a Past-President (2023) of the Dallas Trial Lawyers Association.


Recognized for his exceptional contributions to his field, he received the Reich Chandler Outstanding Advocate Award from the Texas Trial Lawyers Association in 2016, and he has earned numerous other awards and honors for his professionalism and service.