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 – 23rd 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
NJBIZ Names Two Withum Leaders to Finance Power List
Pat Walsh Pat was recognized for his relentless dedication to elevating Withum’s position as a top 20 advisory, accounting and tax firm. This recognition reflects Pat’s leadership and the Firm’s consistent year-over-year growth and strategic expansions into new markets under his guidance. His commitment and contributions to the profession have earned him numerous accolades, including…
Los Angeles Business Journal Names Two Withum Leaders as Women of Influence in Accounting
Kimberly Ravenell, tax partner, was recognized for her commitment to client service and mentorship. With more than 30 years of experience advising high-net-worth individuals and closely held businesses, she provides tax planning and compliance guidance. Kim has played a key role in guiding her team and clients through significant industry and regulatory changes while supporting…
Sameer Uddin Named to Caseware’s 2026 30 Under 30
Advancing Audit Innovation Sameer has played a key role in advancing Withum’s use of audit technology, helping teams adopt new methodologies, improve efficiency and enhance consistency across engagements. A trusted resource for technology implementation, he has been instrumental in the Firm’s adoption of Caseware Cloud and Dynamic Assurance Solutions (DAS) applications. Driving Firmwide DAS Adoption…
Withum Team Members Named as INNOVATE100 Honorees
Leading Industry with a Tech–Forward Vision Matt Walsh, partner and practice leader of Withum’s Industrial and Consumer Products Services Team, was honored in the Finance/Accounting category for helping modernize the Firm’s technology ecosystem. His leadership has supported initiatives that enhance efficiency, streamline workflows and better align technology with evolving client needs, including work with Caseware…
Alan Iosue Named 2026 LA Times Entertainment Business Visionary
As a trusted advisor to entertainment clients, Alan helps organizations navigate the unique opportunities and complexities of an increasingly dynamic, deadline-driven industry. This recognition reflects his commitment to delivering strategic guidance that supports both immediate business needs and long-term success across Southern California’s creative economy. Alan advises production companies, professional athletes, arts organizations and closely…
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