About Our Practice

Providing expert tax and accounting services since 2007

Welcome to Ross-Stern & Associates, conveniently located in Tarzana, in the San Fernando Valley of Los Angeles.

We provide an array of comprehensive tax, certified public accounting, audit, financial management, and financial consulting services for individuals as well as small and medium sized businesses in Los Angeles, Ventura County, Orange County, and throughout the country. You’ll receive personalized support from a firm that focuses on your individual needs. 

Take the next step and learn about the personal and business services we offer.

Our Principals


Tammy Ross-Stern, Certified Public Accountant

Tammy Ross-Stern is the owner and principal of Ross-Stern & Associates. Her practice emphasizes tax and accounting. She has 25 plus years of experience specializing in financial accounting, business valuations, litigation support services, mergers and acquisitions, and taxation of all entities, from small businesses to large public corporations.

Tammy has successfully represented many taxpayers before the Internal Revenue Service, the California Franchise Tax Board, and the California Department of Tax and Fee Administration (CDTFA). She has also been effective in negotiating taxes and penalties with the government.

In addition, Tammy has substantial tax planning and preparation experience for large corporations, high net worth individuals, fiduciary entities, partnerships and limited liability companies. She has valued the cash flow streams and assets of businesses and product lines, specializing in small business ventures.

Tammy has utilized her accounting and taxation skills to successfully manage audit teams working on quarterly and annual SEC filings for publicly traded companies. She has an extensive background in the preparation of supporting evidence materials for litigation. Tammy is qualified as an expert witness and has testified successfully in numerous cases.

Tammy has a Bachelor of Science Degree in Business Administration, Accounting Theory and Practice from California State University, Northridge.


Ellen I. Chokler

With a background of more than 20 years in financial accounting, management consulting, tax planning and preparation, Ellen Chokler has worked with high net worth individuals in a wide range of industries. She has years of experience with all aspects of accounting, including organizing financial activities for numerous clients, as well as preparation of income, payroll, and sales tax returns. In addition, Ellen has helped many clients obtain SBA loans. 

Along with her accounting experience, Ellen has managed a multi-office vocational college with a sizable staff, regularly dealing with the U.S. Department of Education and other government agencies.

Ellen has a Bachelor of Science Degree in Business Administration, Accounting Theory and Practice from California State University, Northridge. She is also fluent in the Russian language.


Our Services



For many years, Ross-Stern & Associates has helped individuals and families manage their tax planning, accounting, and financial planning needs. From minimizing the impact of federal and state taxes, to preparing financial statements, to planning and financing educational, estate, and retirement needs, our tax and accounting specialists can help realize your goals.

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Growing your business is what you do best. Ross-Stern & Associates can help you chart a course for success with our tax, accounting, business planning and management advisory, and audit services. We have helped small and mid-size businesses maximize their profit while minimizing costs and the impact of taxes for many years.

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Ross-Stern & Associates works with a growing array of businesses and organizations. We take time to learn the unique needs and challenges of your business and industry to provide personalized tax, accounting and bookkeeping, audit, and consulting services that can help you grow. 

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