Robert Hymers, CPA 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's created his firm Pinnacle Tax Services and is dedicated to providing nothing but quality and excellence to clients.


Naveed Daniel Sioni

CPA Firm Manager

Danny has been in the accounting profession for many years and is very experienced in the tax and accounting field. He earned his accounting degree from Arizona State University and has loved the subject of accounting from a young age. Danny strives on providing the best quality of services to all of the company's clients, to ensure all of the clients' needs are met with fast yet, efficient strategies.


Lien P Cao, CPA, MST

Senior Tax Accountant

Lien Cao is a senior tax accountant providing highly efficient tax and accounting services to the firm's clients. Lien received her Master's in Tax Law from Loyola Law School.


Allen Yan

Senior Associate

Allen Yan is a senior associate whose educational background comes from Rowan University in New Jersey where he studied finance. Allen has also attended Temple University in Philadelphia where he got his Master's in Tax Law. He is currently preparing for his CPA license from the California Board of Accountancy.


Junghee Lambert

Staff Associate

Junghee’s education in accounting took her all around the world, beginning in Tokyo, Japan, where she attended the prestigious Waseda University and obtained a degree in Finance.  After relocating to California, she continuted her education by attending UCLA and UCSD, before passing the CPA exam.


Hayk Harutyunyan

Staff Accountant

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.