Tax Services
East Brunswick, NJ
Located off the NJ Turnpike on Route 18 in East Brunswick, Withum is one of New Jersey’s largest accounting and advisory firms — and among the top firms in the nation.
Together, we’ll bolster your business plans, navigate ever-changing rules and regulations and anticipate the future of your industry. Our professionals embrace a bold, forward-thinking mindset rooted in integrity and a commitment to excellence. We go beyond traditional services to drive growth and innovation — plus, we offer a whole suite of advisory solutions to level up your success. That’s the Power in the Plus!
East Brunswick Service Specializations
Assurance and Accounting
Business Enterprise Advisors
Outsourced Accounting Systems and Services (OASyS)
New Jersey State and Local Tax Updates
Do you or your organization operate in multiple states? Do you own property in a variety of states? New Jersey State and Local Tax (SALT) laws are always changing and understanding the nuances of the states that you own or operate in is challenging. In these New Jersey resources, you’ll find just a dash of the most up-to-date details on rules and regulations as state and local tax changes happen by state!
Industries We Focus on in East Brunswick
Beyond the Region
- Inside Public Accounting Top 100 Firms – 22nd Largest Nationally
- Accounting Today Top 100 Firms – 22nd Largest Nationally
- Great Place to Work® – Fortune Best Workplaces for Parents and Women
- Vault Top 25 Accounting Firm
Partner In Charge
John M. Mortenson, CPAJohn is the partner-in-charge of our East Brunswick, NJ, office. In addition, John is the Practice leader for the Assurance and Accounting Services for the firm. In this capacity, his responsibilities include overseeing the delivery of all accounting and auditing services to the firm’s clients and include ensuring the firms system of quality control adhere to all professional standards. He has more than 30 years of professional experience. John provides accounting, auditing, tax and business advisory services to many industries, including pharma, biotech, insurance, manufacturing and distribution companies, and also has experience working with SEC reporting companies.
In his community, John is President of the Board of Directors of Embrace Kids Foundation, a not-for-profit organization supporting children with cancer and blood disorders. He resides in Monmouth County, NJ.
East Brunswick Leadership
Withum in the News
Robin Kim Joins Withum Capital as Managing Director of Investment Banking
Robin brings more than 20 years of investment banking and principal investing experience, advising founder-led, family-owned and privately held companies. Throughout his career, he has advised on transactions exceeding $30 billion in aggregate value, including M&A transactions, leveraged buyouts, recapitalizations, restructurings and debt and equity financings. His experience spans a broad range of industries, providing…
Chelsie Rabon Named 2026 Next Generation in Accounting Winner
Chelsie is a leader in Withum’s San Ramon, CA, office, where she specializes in audits of employee benefit plans, labor organizations and multiemployer benefit plans. She was recognized for her dedication to clients, technical proficiency and ability to help organizations address audit and compliance requirements. Chelsie is deeply committed to fostering the next generation of…
Los Angeles Business Journal Names Two Withum Partners as Top Advisors in the San Fernando Valley
Chris Passmore and Steve Martini have made a lasting impact across the San Fernando Valley through their leadership, business advisory skills and community involvement. Recognized for helping businesses navigate change, create opportunity and drive growth, they have strengthened the region’s business community while contributing to its long-term economic vitality. Chris Passmore is the Partner-in-Charge of Withum’s…
Withum Names Eighteen New Partners
Introducing Our 18 New Partners
Withum Announces 2026 Firmwide Leadership Transitions
This next generation of leaders step forward at a pivotal time for the Firm, bringing the technical expertise and strategic perspective needed to navigate continued growth, rapidly advancing technology and an ever-evolving industry landscape. Grounded in the Withum Way mentality, they will shape what’s ahead while preserving the culture that remains central to how the…
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