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About me

I'm originally from Alabama and grew up in Dothan, Alabama where I graduated high school from Dothan High in 1979. After high school, I attended Jacksonville State University where I graduated in 1983 with a degree in Law Enforcement and a minor in English. While attending JSU, I interned with the Calhoun County District Attorney's Office in Anniston, Alabama. After graduating, I married Diane Morgan who graduated with me. We moved to Texas where I accepted a job as a police officer with the Mesquite Police Department and my wife as a R.N. with Baylor University of Medical Center. At Mesquite P.D. I served as a patrol officer, a member of the SWAT team, and was a detective in the Criminal Investigations my last 3 years. I left Mesquite P.D. in 1989 to attend law school at South Texas College of Law in Houston, Texas where I graduated in 1991. While there, I was on the Dean's List several semesters and recieved the American Jurisprudence Award for having the highest grade in my class in Criminal Procedure. While there, I interned at the Calhoun County District Attorney's Office. After law school, I worked for the Dallas County District Attorney's Office where I prosecuted all types of cases from DWI to Murder. I've been in private practice concentrating primarily on DWI defense and criminal defense. I've been interviewed several times by the media, both locally and nationally. I have lectured frequently to other attorneys on multiple subjects including jury selection, cross examination, and DWI blood testing. The last 3 years I have been voted in the top 5 of Dallas County DWI attorneys as recognized by my peers. I'm a member of the Dallas Criminal Defense Lawyer's Association, the Texas Criminal Defense Lawyer's Association, and a founding member DUI Defense Lawyer's Association. I am Board Certified in Criminal Law by the Texas Board of Legal Specialization. Less than 10 percent of lawyers in Texas are board certified in their area, and only approximately 842 are board certified in Criminal Law. I have been married since 1983 and I have 2 daughters, one a junior at the University of Texas and the other a senior at the First Baptist Academy in Dallas. In my spare time, I enjoy the outdoors fishing and hunting and playing with all my rescue pets, 3 dogs, 2 Labrador Retrievers and 1 Blue Heeler. Judges, prosecutors, and other attorneys frequently refer me clients because of my reputation.


Languages spoken: Spanish

Practice areas


  1. DUI & DWI: 75%
    23 years
  2. Criminal Defense: 25%
    23 years


Payment types:

Cash, Check, Credit card

Attorney endorsements

10 total 

Are you an attorney? Endorse this lawyer

  • Cameron Gray

    A super tough lawyer with a heart of gold! I worked with John on a jury trial that ended up with a directed verdict in favor of our client. Case results were so fantastic that the case received acclaim across the United States, Europe, and Mexico! Everyone is so proud to known this great lawyer. The best without question! Cameron Gray, Attorney


    Cameron Gray Criminal defense Attorney
    Relationship: Worked together on matter

  • Brian Vincent Manchester

    John Cook is in the top tier of DUI lawyers in Texas as well as in the entire country. I was introduced to him by another well know DUI lawyer and since getting to know John he continues to amaze me with his courtroom and jury picking abilities. You can't go wrong hiring this man.


    Brian Manchester Criminal defense Attorney
    Relationship: Fellow lawyer in community

Contact info

Law Office of John M Cook

2501 Oak Lawn Ave Ste 560
Dallas, TX, 75219


TXEligible To Practice In Texas 199208/17/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Board Certified - Criminal LawTexas Board of Legal Specialization2016
Top 5 Dallas DWI Lawyer as voted by my peersDallas County Criminal Defense Lawyer's Association2015
Top 5 Dallas County DWI Attorney as voted by my peersDallas County Criminal Defense Lawyer's Association2014
Forensic Chromotagraphy XIII: Theory and PracticeAmerican Chemical Society1999
American Jurisprudence Award- Criminal ProcedureAmerican Bar Association1991
Work experience
TitleCompany nameDuration
OwnerLaw Office of John M. Cook1994 - 2016
Assistant District AttorneyDallas County District Attorney's Office1992 - 1994
Association namePosition nameDuration
DUI Defense Lawyers AssociationFounding Member2014 - Present
Texas Criminal Defense Lawyers AssociationMember1994 - Present
Publication nameTitleDate
Texas Criminal Defense Lawyers AssociationCross Examination of the Arresting Officer in DWI Cases2013
School nameMajorDegreeGraduated
South Texas College of LawN/ADoctor of Jurisprudence/Juris Doctor (J.D.)1991
Jacksonville State UniversityLaw EnforcementN/AN/A
Speaking engagements
Conference nameTitleDate
9th Annual DWI Defense ProjectDWI Voir Dire Strategy2016