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About me

Mr. Mastro grew up around the Bay Area. He graduated from the Santa Clara University School of Law. He sat for and passed the California State Bar Examination on his first attempt.


Thereafter, Mr. Mastro became a Deputy Public Defender in San Joaquin County (Stockton, Tracy), representing indigent clients in all manner of criminal cases.


After opening his own criminal-defense law practice, Mr. Mastro partnered and teamed with Mr. Nino to bring clients as comprehensive and vigorous a representation as possible. After Mr. Nino retired, Joe moved forward with his new, innovative practice, Joe Mastro Law.


Mr. Mastro is a member of the Alameda County Bar Association Criminal Court Appointed Attorneys Program, through which he represents indigent clients in all of the criminal courts of Alameda County. He has represented thousands of clients, with exceedingly positive results.


He is licensed and insured to practice throughout California, as well as in the federal courts of the Northern District of California.


Mr. Mastro enjoys life enough to understand that it is his job to get his clients back to their lives as quickly as possible.


Photos and videos

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Practice areas


  1. DUI & DWI: 45%
    9 years, 500 cases
  2. Criminal Defense: 45%
    9 years, 2.5 thousand cases
  3. Family: 10%
    5 years, 20 cases



Free consultation (45 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

6 total 

Are you an attorney? Endorse this lawyer

  • Peter John Marek

    Joe was an exceptional public defender in San Joaquin County with thousands of cases to his credit. I personally saw the results that he achieved for an often ungrateful clientele. He genuinely cares for his clients and offers an impressive defense. Do yourself a favor and schedule a consultation with him first if you are in or near Oakland and need an aggressive defense.


    Peter Marek Criminal defense Attorney
    Relationship: Fellow lawyer in community

  • Nabiel C Ahmed

    Joseph Mastro is an attorney who cares about justice and fights for his client's rights. Mr. Mastro isn't afraid to zealously represent his clients, and certainly won't back down from aggressive prosecutors. I respect Mr. Mastro's work.


    Nabiel Ahmed Criminal defense Attorney
    Relationship: Fellow lawyer in community

Contact info

Joe Mastro Law

2625 Alcatraz Avenue
Suite 444
Berkeley, CA, 94705


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Pro Bono AwardKatharine and George Alexander Community Law CenterN/A
Work experience
TitleCompany nameDuration
Owner/Managing AttorneyJoe Mastro Law2009 - Present
Deputy Public DefenderSan Joaquin County Public Defender's Office2007 - 2009
Association namePosition nameDuration
Alameda County Bar AssociationMember2010 - Present
Alameda County Bar Association, Criminal Court Appointed Attorneys ProgramMember2009 - Present
Legal cases
Case nameOutcome
People v. Jane DoeATTORNEY OUTCOME: Case continued 1 year and dismissed.
People v. Jane DoeATTORNEY OUTCOME: Client pleaded to a misdemeanor, but sentencing continued 1 year for case to be dismissed if client remained trouble-free; client withdrew plea after 1 year and case was dismissed.
See all legal cases 
Publication nameTitleDate
It Gets Better: Coming Out, Overcoming Bullying, and Creating a Life Worth LivingA "Better" Evolution2011
School nameMajorDegreeGraduated
Santa Clara University School of LawLawJD - Juris Doctor2006
Sonoma State UniversityLiberal StudiesBA - Bachelor of Arts2003