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About me

John O'Brien owns and manages his downtown San Diego civil litigation law firm, which focuses 100% of its time representing individuals and businesses in lawsuits based on personal and business wrongdoing. 

The O'Brien Law Firm represents both plaintiffs and defendants in business litigation and business disputes. As such, John O'Brien both prosecutes and defends lawsuits in areas such as breach of contract, interference with contracts, misrepresentation, fraud, trespass, defamation, theft/embezzlement, and shareholder/partner disputes. 

As the primary member of the law firm, clients are guaranteed to deal personally with John O'Brien from the first phone call through resolution, settlement, or the trial of their business litigation or personal injury lawsuit. He is available 24/7 and strives to develop personal bonds with his clients over and above an attorney-client relationship.


Practice areas


  1. Lawsuits & Disputes: 55%
  2. Business: 15%
  3. Contracts: 15%
    4 years
  4. Consumer Protection: 15%
    4 years



Free consultation (30 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

21 total 

Are you an attorney? Endorse this lawyer

  • Constantine D. Buzunis

    I have know Attorney John O'Brien for many years from the San Diego County legal community and from my work with him personally over the years. I strongly endorse John, and would not hestitate to recommend him to anyone in need of a lawyer.


    Constantine Buzunis Litigation Attorney
    Relationship: Fellow lawyer in community

  • Bonnie Lynn Stokes

    John O'Brien is an excellent attorney with a great track record. He is an aggressive plaintiff's attorney and I often recommend him to clients.


    Bonnie Stokes Real estate Attorney
    Relationship: Worked together on matter

Contact info

The O'Brien Law Firm

525 B Street
Suite 1505
San Diego, CA, 92101


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Pro Bono Legal ServicesLegal Aid Society of San Diego2010
Work experience
TitleCompany nameDuration
Business Litigation AttorneyThe O'Brien Law Firm2009 - Present
Business Litigation AttorneyEnglish & Gloven2008 - 2009
Business Litigation and Personal Injury Law ClerkNeil, Dymott, Frank, Harrison & McFall, LLP2007 - 2008
Legal InternStutz Artiano Shinoff & Holtz Apc2007 - 2007
Personal Injury Law ClerkBeach Whitman, LLP2006 - 2006
Law ClerkUnited States Attorney's Office San Diego2006 - 2006
Association namePosition nameDuration
Association of Business Trial LawyersMember2014 - Present
Consumer Attorneys of San DiegoMember2010 - Present
State Bar of CaliforniaMember2007 - Present
San Diego County Bar AssociationMember2007 - Present
Legal Aid Society of San DiegoVolunteer Attorney2009 - 2010
Legal cases
Case nameOutcome
Boat Buyer v. Boat SellerClient Prevailed and awarded over $89,000.00.
Computer Leasor v. Computer LeaseeCase Settled for $7,000
Ex-Partner v. Solar Energy CompanyCase settled for a confidential amount.
See all legal cases 
School nameMajorDegreeGraduated
California Western School of LawN/ALaw2007
Boston CollegeEconomicsBA - Bachelor of Arts2003