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About me

I am South Texas born, raised and educated.  Professionally, I have only been a trial lawyer.  Started out as an Assistant District Attorney in Bexar County.  Handled and tried hundereds of cases from DWI to Capital Murder. 

Enjoyed a successful career in prosecution.  Then, met and married my love and partner, Christine Martino Del Prado.  We have established our own firm and been successful.  More importantly, we established a great family and are truly blessed.

We believe in our mission to protect an defend the Constitution of the United States and Texas.  As such, we zealously - and aggressively represent our clients.  Collectively, we bring 50 plus years of experience and success to bear in every one of our cases.  

If we can serve you, call.  You will find that we are accessible and honest.




Languages spoken: Spanish

Practice areas


  1. Criminal Defense: 60%
    29 years, 500 cases
  2. Federal Crime: 25%
    0 years
  3. DUI & DWI: 15%
    25 years, 500 cases



Fixed (always), Free consultation (30 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

3 total 

Are you an attorney? Endorse this lawyer

  • Aniko R. Hoover

    I endorse this lawyer. Mario has been doing this a long time- he knows all the tricks and is a great talent!! =)


    Aniko Hoover DUI & DWI Attorney
    Relationship: Fellow lawyer in community

  • Michael S. Waddington

    I endorse Mario. He is a highly skilled attorney that is well respected in the legal community.


    Michael Waddington Military Law Attorney
    Relationship: Fellow lawyer in community

Contact info

301 S. Main Ave
San Antonio, TX, 78204

301 S. Main Ave
San Antonio, TX, 78204

Del Prado and Del Prado, attorneys at law

301 S. Main Ave
San Antonio, TX, 78204



TXEligible To Practice In Texas 198610/19/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Texas Super LawyerThompson West Publishing2013
Top 30 Criminal Defense Lawyers San AntonioSA Scene Magazine2013
Best Lawyers in San AntonioSan Antonio Magazine2012
Texas Super LawyerSuper Lawyers2012
College of the State BarState Bar of Texas2009
Scholarship Trial Lawyers College Death PenaltyTrial Lawyers College2009
Board Certified Criminal Law SpecialistTexas Board of Legal SpecializationN/A
Board Certified Criminal Trial SpecialistNational Board of Trial AdvocacyN/A
Work experience
TitleCompany nameDuration
PartnerDel Prado & Del Prado1991 - Present
Assistant District AttorneyBexar County District Attorney1984 - 1991
Association namePosition nameDuration
San Antonio Criminal Defense Lawyers AssociationBoard of Directors2012 - Present
San Antonio Criminal Defense Lawyers AssociationN/A2005 - Present
National College of DUI DefenseMember2005 - 2009
Texas Criminal Defense Lawyers AssociationMember1991 - Present
Legal cases
Case nameOutcome
State v CastilloNot guilty
See all legal cases 
School nameMajorDegreeGraduated
St Mary's University of San AntonioN/AJD - Juris Doctor1986
Speaking engagements
Conference nameTitleDate
San Antonio Criminal Defense Lawyers AssociationFamily Violence2011
Capital Murder UpdateGetting Life Plea in Middle of Death Case2008
Capital Murder SeminarHow to Get a Life Sentence in the Middle of a Death Penalty Case2008
San Antonio Criminal Defense Lawyers Association Nuts and BoltsDomestic Violence2005