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Home Our People Zsia Rosmarin

Zsia Rosmarin


CPA, MS, Team Leader, Women in Tech, Tax Lead, Technology and Emerging Growth

I'm a problem solver.
Zsia Rosmarin, CPA, MS, Partner


Based in the firm’s Whippany office, Zsia is a partner with over 20 years of experience in the accounting profession. She is a strategic tax Partner with deep expertise in tax planning and consulting, including business tax returns and tax provisions under ASC 740 for multi-state and multi- national companies.

Zsia leads the Tax Tech and Emerging Growth Industry Group where she consults on a wide variety of related tax issues including diligence ready assessments, secondary transactions, qualified small business stock, tax credits and incentives (i.e. R&D, excelsior, QETC), state taxes including sales tax and international taxes. Zsia also serves as the Women in Tech Team Leader for the Technology and Emerging Growth Industry Group. She has a passion for mentoring women Founders and Executives. She spearheads networking events, seminars, and dinners / happy hours that enable women to grow their network and community.

Zsia is also the Co-Leader of “Women of Withum’s” empowerment program, which focuses on the elevation and inspiration of women. She is a dynamic and devoted leader, and among other recognitions, was named one of New Jersey’s 2019 Best 50 Women in Business by NJBIZ. In 2010 Zsia was honored as “Woman of the Year” by the American Woman’s Society of Certified Public Accountants of New Jersey. She resides in Somerset County, NJ.

Previously, she was a partner at a large national accounting firm and a senior manager at a “Big Four” firm. Zsia graduated from the State University of New York, Albany, with a BS degree in accounting and earned her MS degree in taxation from the same institution. She is a member of the American Institute of Certified Public Accountants (AICPA) and the New Jersey Society of Certified Public Accountants (NJCPA).

Withum isn’t just a job— we’re a family, and we carry that spirit together in everything we do. We live the Withum Way. We are catalysts for growth and success.

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