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Main Office

  • 1700 S EL CAMINO REAL STE 506
  • SAN MATEO, CA 94402-3051
  • Main Number: 650-574-5000
  • Fax: 650-574-2334
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Thomas H. Vocker, CPA

In Memory- Former Managing Partner & Co-Founder

September 1948 - May 2017

Tom passed away surrounded by his family on 2 May 2017.

The firm will continue to provide the quality services and support his nonprofit interests, as it has over the years under his management, and retain the name Vocker Kristofferson and Co.

Thomas H. Vocker co-founded the firm in 1990 with over sixteen years of experience at a large local CPA firm including ten years as an audit partner. He provided tax planning and preparation services and business consulting services for over forty-five years. He was skilled in directing an engagement team that understood the client’s business, and in utilizing audit and review findings as a foundation for making recommendations to management. 

Tom offered his extensive business experience to community organizations and not-for-profit entities. He provided counsel on such matters as long-range planning and fund raising.  His community involvement in various organizations included serving president and board member of the Peninsula Association of Retarded Children and Adults, as president and treasurer of the Rotary Club of San Mateo, and San Mateo Rotary Haciendas, Inc., and as a member of the boards of the San Mateo County Government Research Foundation, St. Raymonds School, HIP Housing and San Mateo PAL.  Tom held a BS degree in economics from the University of San Francisco, and completed classes in the Masters in taxation program at Golden Gate University, San Francisco.


Marianne H. Kristofferson, CPA

  • Phone: 650.574.5000
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Marianne Kristofferson co-founded the firm in 1990 with eight years of experience at a large local CPA firm.  Her experience has covered both the audit and tax areas for all of her client responsibility.  Marianne holds a BS degree in business-economics from the University of California, Santa Barbara and a Masters in taxation from Golden Gate University, San Francisco.  Her community involvement in various organizations includes serving as a board member of the San Mateo-Foster City Community Education Foundation, the Highlands Recreation District, and Music at Kohl Mansion.  Marianne previously served as treasurer of the Rotary Club of Burlingame and of the Congregational Church of San Mateo.  Marianne currently serves on the State Committee of the Accounting Practices and Accounting Standards and previously served on the State Peer Review Committee for two terms.


Michael Y. Kim, CPA

  • Phone: 650.574.5000
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Aaron Chin, CPA

Senior Staff Accountant
  • Phone: 650.574.5000

Aaron graduated from the University of California, Santa Cruz with a Bachelor of Arts in Business Management Economics in June 2013 and started working at Vocker Kristofferson and Company in August 2013.

He obtained his CPA license in October of 2016 and is continuing to develop himself as a professional in the field of taxation and audit.

His hobbies and interests include the automotive industry, trying new restaurants, and learning about the latest technology trends.

Randy Thai

Staff Accountant
  • Phone: 650.574.5000

Randy joined Vocker Kristofferson and Co. at the start of 2017. Having received his Bachelor of Science degree in accounting from San Jose State University in 2014, he has continued in this direction with the pursuit of his CPA license. His dedication and hard work has made him an integral part of the firm.

Office Manager

  • Phone: 650.574.5000
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