Robert Hymers, MST (Taxation)

Managing Partner

Mr. Hymers was a member of EY's National Tax Group (FSO) for several years, which services private equity firms, hedge funds and banks. Mr. Hymers has a Master's of Science degree in Taxation (MST), Bachelor's of Science in Accountancy and a Bachelor's degree in Business Administration from California State University, Northridge (CSUN). He is the founding Managing Editor of CSUN's The Tax Development Journal and has published several tax articles. He is the founding managing partner of Pinnacle Tax Services and is dedicated to providing nothing but quality and excellence to clients.


Serena W. Zhang, CPA

CPA Firm Manager

Serena is a licensed CPA in California and has a Master’s degree in accounting from Emporia State Univeristy and a Bachelor’s of Science degree in Mathematics from University of Kansas. She can be reached via email address: Serena.zhang@pinnacletaxandaccounting.com


Morraine Liao

Tax Associate

Morraine is a tax accountant providing highly efficient tax and accounting services to the firm's clients. She attended the Southwestern University of Finance and Economics in China and obtained a bachelor degree in Financial economics. After relocating to California, she obtained her Master's degree of Professional Accountancy (MPAc) in University of California, Riverside.


Lexi Chen

Tax Associate

Lexi Chen is a tax associate helping individuals and businesses with accounting and tax issues. She attended the University of California, Riverside, where she earned a Master’s of Professional Accountancy. She is working on obtaining her CPA license. 


Tammi Tang

Tax Associate

Tammi earned her accounting degree from the University of California, San Diego, and she was a member of UCSD Accounting Society. Professionally, she enjoys the challenge of solving problems and helping out with her clients' needs, while delivering the best tax services. She is excited to be working in public accounting with Pinnacle Tax Services and is currently in the process of obtaining her CPA license.


Hayk Harutyunyan

Senior Tax Associate

Hayk earned a Bachelors in Management Information Systems at the Armenian State University of Economics. He took numerous accounting classes sponsored by the Association of Accountants and Auditors of Armenia. Although his academic emphasis was IT related, Hayk has extensive education and over 5 years of professional experience as a licensed Chartered Accountant in Armenia. His unique skill set related to both IT and Accounting, makes him a key asset to Pinnacle and the Firm's clients.


Diego A. Conejo

Client Relationship Manager

Diego is our Client Relationship Manager and resident financial planner. Diego has extensive experience in banking, real estate finance, insurance and retirement planning. He currently holds series 6, 63, 65, 26 and life insurance licenses, and is always available to review your financial plan. He can be reached via email address: diego.conejo@pinnacletaxandaccounting.com