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David C. Ristau
Founding Partner
After graduating from San Jose State in 1962, David became a Revenue Agent for the IRS. After four years in the San Francisco Bay Area, he transferred to Modesto. Three years later, he left the IRS for an accounting position with a local firm.  It wasn't long before David was ready for his own accounting practice. In 1972, he started Ristau & Co.  Though the firm has grown with our city, our focus remains on personal attention to every client.
David specializes in tax preparation, planning, and the financial health and practices of the small, family held, and mid-size businesses. He also holds the designation of CFP-CPA. Certified Financial Planner - Certified Public Accountant.



Keith Cherry

Managing Partner

A principal and managing partner, Keith has been with the firm since he graduated from California State University, Stanislaus, in 1977, with his degree in Accounting. 


Keith's specialties include the planning and supervision of reviews and compilations, providing Management Advisory Services, Tax and Estate planning, and preparation of tax returns.


He is a member of the California Society of Certified Public Accountants, the American Institute of Certified Public Accountants, and the Modesto Sunrise Rotary.




Ryan Root


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.




Kathaleen De Salles

Kathaleen DeSalles joined the firm in 2015, bringing more than 20 years of experience. After graduating from California State University, Stanislaus in 1989, her career began with Arthur Andersen & Company in San Francisco.  In 1993 she returned to the Central Valley to be closer to her family.  Kathaleen's taxation experience includes the fields of construction, real estate, manufacturing, agriculture, distribution, and small business.  She has vast experience regarding individual, partnership and corporate taxation, as well as estate planning and trust tax returns.

Kathaleen is a member of the American Institute of Certified Public Accountants and a member of the California Society of Certified Public Accountants.  She serves as a member of the board of directors for the Parent Resource Center, a local non-profit child abuse prevention agency. 


Nannette Fenley McKay
Management Systems Consultant
Phone: 209-604-4411
Nannette is a CPA who specializes in on-site accounting software set up and training. She graduated from Cal Poly San Luis Obispo, in December of 1981, with a BS Degree in Business with a Concentration in Accounting. She joined Ristau & Co., in 1990.
Nannette brings a wealth of knowledge and experience to our firm that she uses to help clients set up and learn new or upgraded accounting software and systems. She is a certified QuickBooks ProAdvisor and helps clients onsite.
Prior to joining our firm, Nannette gained valuable experience as the Finance Administrator for Medic Alert Foundation; Chief Financial Officer for Charles Fenley Enterprises; Manager of Financial Reporting for Charles Schwab; and auditor at Deloitte, Haskins & Sells.
She is a member of the AICPA and the CSCPA. In addition, she is a consultant with the Sleeter Group and an Intuit QuickBooks Certified Professional Advisor.

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