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
Withum in the East Brunswick Community
Our team members have a deep connection to the communities in which we live and work, it’s a significant reason businesses choose Withum. We believe in making a difference — not just for our clients, but for the people and neighborhoods around us. Through volunteerism, charitable giving and active involvement in local causes, our team is passionate about giving back and lifting others up. It’s all part of the Withum Way.
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
Partner, Service Leader
East Brunswick, NJ
Industry Leader, Partner, Practice Leader
East Brunswick, NJ
Industry Leader, Partner
East Brunswick, NJ
Partner, Practice Leader, Service Leader
East Brunswick, NJ
Partner
East Brunswick, NJ
Withum in the News
Withum Launches Unified Client Collaboration Platform to Simplify Client Engagement Across the Service Lifecycle
ClientConnect consolidates traditionally disconnected client-facing tools into a single platform, reducing complexity across the engagement lifecycle—from request intake and document exchange to deliverables and payment. The solution reflects Withum’s continued investment in digital transformation while addressing the evolving expectations of today’s clients. “We didn’t just want to adopt technology; we wanted to shape the future of client engagement across…
Withum Launches Redesigned Website to Support AI-Driven Search and Intuitive User Experience
The new site emphasizes clarity, speed, and accessibility—making it easier for users to find relevant content, explore the Firm’s services, and connect directly with Withum’s people and expertise. The Firm’s newly redesigned website reflects a shift in delivering insights digitally by aligning user experience, modern search behavior and growth strategy under a single, purpose-built platform. “Withum’s new website is built for…
Kelsey Thomas Named Opus Connect’s 2025 Woman of the Year
This annual recognition honors a member who demonstrates exceptional commitment to the Opus Connect community through consistent participation, leadership and meaningful support of peers. Kelsey was recognized for her commitment to advancing the industry and its community through an M&A lens. Throughout her over 15-year career in public accounting, Kelsey has distinguished herself through seasoned…
Linda Howard Named to Women in CX’s Awesome Women to Follow in CX List
Linda is an active member of Women in Client Experience, Women of Withum and the Association for Accounting Marketing’s Client Experience Circle. She believes in building networks and sharing best practices to strengthen client and team member service experiences. “Linda has been a driving force in shaping what a client experience program will look like at Withum….
BINJE Names Marcus Dyer to 2026 Best Black Business Leaders List
Marcus draws on his law background to represent clients in commercial and tax disputes before state courts, Federal District Court and the United States Tax Court, frequently resolving matters through alternative dispute resolution rather than litigation. As an industry thought leader, Marcus contributes to a wide range of publications, helping businesses and individuals navigate high-risk…
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