OAKLAND OFFICE

The Oakland office was established in 1946 by Leo Helzel, an Oakland attorney and CPA, in a small office near 14th and Broadway. The current 475 - 14th Street location is home to twenty staff and is growing.  Brenda Colburn Jemmot serves as head of our Oakland office.

Oakland City Center

475 14th Street
Suite 1200
Oakland, CA 94612

Ph: (510) 893-6908

Fax: (510) 873-0977

Oakland City Center

475 14th Street
Suite 1200
Oakland, CA 94612

Ph: (510) 893-6908

Fax: (510) 873-0977

< Oakland Office

John A. Mangini

CPA, CVA, CFF

John’s practice includes family law consulting, litigation support, business valuations and forensic accounting for individuals, families, trusts, and closely-held business owners. John has qualified as an expert witness in the following counties: Alameda, Contra Costa, San Francisco, Santa Clara, San Mateo, Marin and Napa. He also is a frequent speaker at professional and industry organizations such as the Contra Costa County Bar Association; Marin County Family Law Center; San Francisco Bar Association; and the American Academy of Matrimonial Lawyers. John is a board member and treasurer of The First Tee East Bay.

Focus
  • Litigation Consulting Services, Family Law
  • Business Valuations
  • Forensic Accounting

John A. Mangini

CPA, CVA, CFF

John’s practice includes family law consulting, litigation support, business valuations and forensic accounting for individuals, families, trusts, and closely-held business owners. John has qualified as an expert witness in the following counties: Alameda, Contra Costa, San Francisco, Santa Clara, San Mateo, Marin and Napa. He also is a frequent speaker at professional and industry organizations such as the Contra Costa County Bar Association; Marin County Family Law Center; San Francisco Bar Association; and the American Academy of Matrimonial Lawyers. John is a board member and treasurer of The First Tee East Bay.

Focus
  • Litigation Consulting Services, Family Law
  • Business Valuations
  • Forensic Accounting

Credentials

University of California, Berkeley, Bachelor of Science Degree, School of Business Administration, Emphasis in Accounting, 1974

Certified Public Accountant, 1977

Certified Valuation Analyst, 2009

Certified in Financial Forensics, 2009

Organizations

California Society of Certified Public Accountants

American Institute of Certified Pulbice Accountants

NACVA (National Association of Certified Valuation Analysts)