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Computers & Quickbooks


Founding Partner
Founding Partner David C. Ristau started the company as a one man office in 1972. He officially retired after tax season this year. "I've had many wonderful clients who are like family. Many have been with me for more than 40 years. It's difficult to say goodbye, but I know my clients are in the good, capable hands of my long-time business partners, Keith, Judie, and Ryan." 



Managing Partner
Keith Cherry is a Certified Public Accountant and has been with the firm for more than 40 years. He is a graduate of Stanislaus State University and has become an expert in the family owned business. He serves families, individual, and business clients.  Keith is also an active member of Sunrise Rotary.
Contact Keith directly at keithc@ristau-cpa.com 


Judie Brimmer
Partner: Bookkeeping Manager
Judie Brimmer has run our Bookkeeping Department for 40 years. With her amazing talent to multi-task, manage, advise, and give her undivided attention to every client at any given moment, Judie may be our greatest asset.
 Contact Judie directly at judie@ristau-cpa.com


Ryan Root, CPA


Ryan received a Bachelor’s degree in accounting from Pacific Union College in 1996.  He began working for a nonprofit organization in the accounting department in the Bay Area in 1996, then began working with a CPA firm in Sonora in 1999 bringing accounting, taxation and trust administration background to the firm. He received his Certified Public Accountant license in 2005. Ryan is experienced in audit and review services, preparation of personal and business tax returns, compilation of financial statements, payroll, sales and property tax returns, as well as computer software. Ryan has honed his expertise in taxation engagements and financial statements.  He is constantly enhancing his skills as an accountant through continuing education in the changing world of taxation and accounting and became a partner in the firm in 2016.  Ryan is dedicated to professionalism and seeks to provide personal quality service to all clients.  His strong educational and accounting background will ensure proper management and assistance with your financial and taxation matters.

Contact Ryan directly at ryan@ristau-cpa.com  

Our Staff:
Click name for information / Click e-mail to contact.
Managing Partner
Manager: Systems Consultant
Partner: Bookkeeping Manager
Administrative Assistant
Administrative Assistant / Tax Season
Website Manager


101 College Ave., Ste.1,   Modesto,   CA   95350
Phone: (209) 521-1376      Fax: (209) 521-0658