FIND YOUR EXPERT
Douglas S. Collins, CPA
Partner
Services: Accounting, Business Advisory, Individual & Business Tax Planning, Tax Services
Industries: Construction Contractors and Services, Family Owned Business, Manufacturing, Private Equity, Real Estate, Small & Medium-Sized Business
Contact: (973) 298-8500 • dcollins@nisivoccia.com • LinkedIn
Doug works closely with business owners, executives, and high-net-worth individuals to develop thoughtful tax planning strategies that support long-term business and personal financial goals. Known for his collaborative and practical approach, Doug helps clients optimize tax efficiency while navigating complex regulatory and financial considerations.
Doug specializes in tax, audit, and advisory services for real estate developers and investors, private equity firms, professional service firms, construction contractors, and manufacturing entities. He also has extensive experience advising shareholders, officers, and other senior executives on tax planning and wealth-related matters. Doug serves as the Partner Lead for Nisivoccia’s Real Estate and Tax Group.
Areas of Focus:
- Tax planning and compliance for closely held businesses and individuals
- Real estate development and investment
- Private equity and professional services firms
- Construction and manufacturing industries
- Executive and shareholder advisory services
Education & Licensure:
- B.S. in Accounting, Messiah College in Grantham, Pennsylvania
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- American Institute of Certified Public Accountants (AICPA)
- New Jersey Society of Certified Public Accountants (NJCPA)
Nisivoccia Wealth Advisors LLC
- Series 7, Series 66 and Life and Health Insurance Licensed
Community & Professional Involvement:
- Member of the Advisory Board, Newton Medical Center
- Member of the Board of Directors of AHS Investment Corp., a subsidiary of Atlantic Health
- Member of the Board of Directors for the Deacon Family Foundation
- Former Advisory Board Member, Lakeland Bank
Doug celebrates his 34th year of service with our firm in 2026.
Deirdre M. Hartmann, CPA
Partner
Services: Accounting, Business Advisory, Client CFO Services, Individual & Business Tax Planning, International Tax, Tax Services
Industries: Family Owned Business, Healthcare, Private Equity, Small & Medium-Sized Business
Contact: (973) 298-8500 • dhartmann@nisivoccia.com • LinkedIn
With more than 25 years of experience, Deirdre specializes in personal and business income tax planning, advisory services, and complex entity structures, including foreign subsidiary corporations. She leads Nisivoccia’s Healthcare Group, advising medical, dental, and healthcare organizations across New Jersey on tax planning, operational efficiency, and long-term growth strategies.
Deirdre was instrumental in establishing the firm’s Client Advisory Services (CAS) Practice and continues to lead the team today, helping clients improve financial visibility, streamline processes, and strengthen decision-making.
A frequent lecturer, writer, and advisor, Deirdre regularly shares insights with businesses, professional and industry audiences on tax policy, healthcare finance, business advisory and operational efficiency topics, and revenue cycle analysis with small and mid-sized businesses, industry associations, and healthcare organizations.
Areas of Focus:
- Healthcare, medical, and dental practice advisory
- Business income tax planning
- Client & Accounting Outsourced Services
- Business process optimization and revenue cycle analysis
- Complex entity and subsidiary structures
Education & Licensure:
- B.S. in Accounting, Montclair State University
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- New Jersey Society of Certified Public Accountants (NJCPA)
- Healthcare Leaders Association of New Jersey (HLA – NJ)
- New Jersey Healthcare Financial Management Association (NJHFMA)
- Small Business Council of America (SBCA)
Community & Professional Involvement:
- Advisory Board Member, County College of Morris Business Program
- Board Member, Small Business Council of America
- Former Board Member, Prevent Child Abuse of New Jersey
- Volunteer, CF Foundation for SIDS
- Volunteer, Habitat for Humanity
- Volunteer, nourish.NJ
- Volunteer, Holiday Help for the Needy
Nisivoccia Wealth Advisors LLC:
- Series 7, Series 66, and Life and Health Insurance Licensed
Honors & Recognition:
- 2019 NJCPA Ovation Award Winner, Women to Watch Category
- 2026 NJBIZ Leading Women in Business Award
Thought Leadership & Publications:
- “Tips, Overtime & Compliance: What HR and Finance Leaders Need to Know About the ‘One Big Beautiful Bill’ – EANJ
- “The Learning Curve for Advisory” – NJCPA
- “Private Equity Knocking? What to know before you let them in” – In-Network Healthcare Industry News from Investors Bank
- “New Jersey Telemedicine Providers: Do You Know the ‘Ins and Outs’ of the New Law?” – Nisivoccia LLP Blog
- “Healthcare Fraud and the CPA” – New Jersey Business Magazine
Deirdre will celebrate her 20th year of service with our firm in 2026.
Dominick J. (Nick) Sarinelli, CPA, CFE
Managing Partner
Services: Accounting, Business Advisory, Individual & Business Tax Planning, Tax Services
Industries: Construction Contractors and Services, Family Owned Business, Manufacturing, Real Estate, Small & Medium-Sized Business
Contact: (973) 298-8500 • dsarinelli@nisivoccia.com • LinkedIn
Nick brings nearly four decades of experience at Nisivoccia, a New Jersey CPA firm, and has served as the firm’s Managing Partner since January 1, 2026. He provides tax, accounting, and consulting services to a broad range of clients and works closely with business owners and management teams to address complex financial, compliance, and operational matters.
Nick serves clients across a wide range of industries, including technology, construction, medical services, manufacturing, professional services, and other closely held businesses. In addition to his technical expertise, he offers practical, experience-driven guidance and is valued for his deep institutional knowledge and long-standing client relationships. Nick also brings fraud-related expertise to his work as a Certified Fraud Examiner (CFE), supporting clients with risk awareness and internal control considerations.
Areas of Focus:
- Tax planning and compliance
- Business consulting and advisory services
- Construction and contracting
- Technology, medical services, manufacturing, and professional services organizations
- Fraud awareness and internal control considerations
Education & Licensure:
- B.S. in Accounting, Rutgers University
- Certified Public Accountant (CPA) License: New Jersey
- Certified Fraud Examiner (CFE)
Professional Memberships & Affiliations:
- American Institute of Certified Public Accountants (AICPA)
- New Jersey Society of Certified Public Accountants (NJCPA)
- Association of Certified Fraud Examiners (ACFE)
Community & Professional Involvement:
- Treasurer, 200 Club of Morris County
- Former Treasurer, Court Appointed Special Advocates (CASA) of Morris and Sussex Counties, Inc.
- Former Treasurer, Mount Olive Area Chamber of Commerce
- Member and Former Treasurer, Roxbury Rotary Club
Nisivoccia Wealth Advisors LLC:
- Series 7, Series 66 and Life and Health Insurance Licensed
Honors & Recognition:
- Honored by the Metropolitan Builders & Contractors Association (METRO) as the 2018 Associate of the Year
- Recognized as a Paul Harris Fellow by the Rotary Foundation
Nick celebrates his 37th year of service with our firm in 2026.
Glenn Schwier, CPA, J.D.
Partner
Services: Accounting, Business Advisory, Individual & Business Tax Planning, International Tax, IRS Representation, Tax Services
Industries: Small & Medium-Sized Business
Contact: (973) 298-8500 • gschwier@nisivoccia.com • LinkedIn
Glenn specializes in complex personal and business tax matters, including estate and trust taxation, individual income tax planning, expatriate taxation, and foreign asset reporting. He oversees Nisivoccia’s international business tax practice and advises clients on cross-border tax considerations and compliance requirements.
Glenn is admitted to practice law in New Jersey and New York and is widely recognized for his ability to translate complex tax legislation into practical guidance. He is a frequent lecturer and advisor to business organizations and professional services firms on tax planning topics, including the Tax Cuts and Jobs Act, business efficiency strategies, and evolving tax policy. Glenn also hosts tax planning seminars for practicing attorneys.
Areas of Focus:
- Individual, estate and trust taxation
- Expatriate taxation and foreign asset reporting
- International business tax planning and compliance
- Cross-border tax considerations
- Legislative and regulatory tax guidance
Education & Licensure:
- B.S. in Accounting, Rutgers University
- Juris Doctor (JD) Degree, Seton Hall University
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- New Jersey Society of Certified Public Accountants (NJCPA)
- BKR International Tax Practice Group
Nisivoccia Wealth Advisors LLC:
- Series 7, Series 66 and Life and Health Insurance Licensed
Glenn celebrates his 17th year of service with our firm in 2026.
David Benson, CPA
Principal
Services: Accounting, Business Advisory, Individual & Business Tax Planning, Tax Services
Industries: Construction Contractors and Services, Real Estate, Small & Medium-Sized Business
Contact: (973) 298-8500 • marketing@nisivoccia.com
David joined Nisivoccia bringing more than 14 years of prior tax management experience. He provides tax planning and compliance services to clients in the real estate industry, self-employed business owners, and high-net-worth individuals, helping them navigate complex tax matters and make informed financial decisions.
David is valued for his practical approach and strong understanding of tax strategies affecting closely held businesses and individuals.
Areas of Focus:
- Tax planning and compliance
- Real estate tax services
- Self-employed and closely held businesses
- High-net-worth individuals
Education & Licensure:
- B.S. in Accounting
- M.S. in Taxation, Northeastern University
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- American Institute of Certified Public Accountants (AICPA)
- New Jersey Society of Certified Public Accountants (NJCPA)
Community & Professional Involvement:
- Volunteer for Morris Habitat for Humanity
David celebrates his 7th year of service with the firm in 2026.
Katie Ross, CPA
Principal
Services: Individual & Business Tax Planning, IRS Representation, Tax Services
Industries: Construction Contractors and Services, Family Owned Business, Manufacturing, Private Equity, Real Estate, Small & Medium-Sized Business
Contact: (973) 298-8500 • marketing@nisivoccia.com
Katie is a key member of Nisivoccia’s Tax Department, providing tailored tax planning and compliance services to closely held businesses and individuals. She works closely with clients to streamline internal accounting processes, reduce compliance complexity, and support sustainable growth.
With prior public accounting experience before joining Nisivoccia, Katie brings a practical, client-focused approach to tax advisory services and is particularly committed to supporting local businesses.
Areas of Focus:
- Tax planning and compliance
- Closely held and local businesses
- Process improvement and accounting coordination
- Client-focused tax advisory services
Education & Licensure:
- B.S. in Accounting, Ramapo College of New Jersey
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- American Institute of Certified Public Accountants (AICPA)
- New Jersey Society of Certified Public Accountants (NJCPA)
Katie will celebrate her 7th year of service with the firm in 2026.
Harlene Stevens, CPA
Director of Tax
Services: Accounting, Business Advisory, Individual & Business Tax Planning, Tax Services
Industries: Healthcare, Small & Medium-Sized Business
Contact: (973)-298-8500 • marketing@nisivoccia.com • LinkedIn
Harlene specializes in personal and business income tax planning, with a strong focus on dental and medical practices. With more than 25 years of experience serving healthcare clients, she leads Nisivoccia’s Dental Practice Group and works closely with practice owners to address complex tax, cash flow, and operational considerations.
Harlene is a frequent writer and speaker on tax and practice management topics, including tax planning strategies, front-office operations, cash management, and workforce-related legislation. Her insights have been featured in a variety of industry and professional publications, and she is widely regarded as a trusted advisor to dental and medical professionals.
Areas of Focus:
- Tax planning for dental and medical practices
- Personal and business income tax planning
- Healthcare practice advisory services
- Cash management and budgeting
- Practice operations and workforce considerations
Education & Licensure:
- B.S. in Accounting, Rutgers University
- Certified Public Accountant (CPA) License: New Jersey
Professional Memberships & Affiliations:
- American Institute of Certified Public Accountants (AICPA)
- New Jersey Society of Certified Public Accountants (NJCPA)
Community & Professional Involvement:
- A volunteer member of the National Ovarian Cancer Coalition
- Morris County Chamber of Commerce Women in Business Executive Committee
Recent Speaking Engagements:
- “One Big Beautiful Bill Act (OBBBA): Key Changes” at the Small Business Forum ’25 hosted by Laddey, Clark & Ryan (2025)
- “2023 Taxing Questions and NJ State and Federal Tax Updates” at the Somerset County Business Partnership (2023)
- “What to Expect When You File Your 2022 Taxes Next Year” at the Annual Tax Talk presented by FiSig, an organization hosted by the Somerset County Business Partnership (2022)
- “The Financial Implications of Divorce: A Tax and Legal Perspective – Parts 1 & 2” for Nisivoccia clients and prospects (2022)
- “Practical Tips for Budgeting” for BWNice Warren County (2020)
- “Important State and Federal Tax Updates for Your Business” at the Roxbury Chamber of Commerce (2020)
- “Reducing Taxes with Effective Financial Planning” for the New Jersey Business Industry Association (2019)
- “You Earned It, Now Keep It” at the Morris County Chamber of Commerce Lunch and Learn (2019)
Harlene celebrates her 19th year of service with our firm in 2026.