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Katherine Alphonso focuses her practice on data privacy and cybersecurity, specifically advising on best practices for California Consumer Privacy Act (CCPA) and General Data Protection Regulation (GDPR), various areas of employment law, business litigation, and transactional business law.  She counsels on collective Private Attorney General Act (PAGA) matters, discrimination claims, wrongful termination & retaliation actions, ADA web and structural access disputes, and unfair competition allegations. 

Ms. Alphonso drafts and reviews various contracts including partnership formations, contractor/subcontractor agreements, and commercial lease agreements. In homeowners’ association (HOA) matters, she defends disputes around Covenants, Conditions, and Restrictions (CC&Rs) and individual homeowner rights, as well as HOA obligations and assessments. In addition, she performs clearance searches and risk assessments for advising on trademark availability.

Prior to attending law school, Ms. Alphonso worked in the dialysis industry overseeing licensing and compliance requirements.


  • California


  • Golden Gate University School of Law – J.D.
  • University of California, Berkeley – B.A., Political Science & Psychology

Professional Memberships

  • Women in Security and Privacy
  • Alameda Country Bar Association, Board of Directors for the Intellectual Property Committee

Awards & Honors

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Mansfield Rule Certified 2023 Super Lawyers Super Lawyers Best Law Firms 2023 Best Law Firms 2024 Martindale Hubbel AV Preeminent Law 360