Mark Tessar, CPA, CIA

Biography

Mr. Tessar is an Audit Principal with over 16 years of public accounting experience. He specializes in providing audit, accounting, and advisory services to nonprofit organizations, foundations, and other mission-driven entities.

He has extensive experience auditing organizations that receive federal and state funding and routinely works with clients subject to Uniform Guidance and Single Audit requirements. He advises boards and executive leadership on financial reporting, internal controls, governance best practices, and regulatory compliance, helping organizations strengthen transparency and accountability while staying focused on their mission.

Throughout his career, Mr. Tessar has served a broad range of tax-exempt organizations, including human services agencies, educational institutions, arts and cultural institutions, and private foundations. His work includes significant experience auditing international organizations and navigating the complexities of cross-border operations, global regulatory requirements, and multi-currency financial reporting. He is known for a practical, collaborative approach that translates complex accounting and compliance issues into clear, actionable guidance for management and boards.

Mr. Tessar is a Certified Public Accountant and is an active member of the American Institute of Certified Public Accountants (AICPA) and the New York State Society of CPAs. He frequently presents on nonprofit accounting and compliance topics and enjoys working with organizations that make a meaningful impact in their communities.
Outside of client work, Mr. Tessar is passionate about supporting the nonprofit sector through volunteer service and professional education, and is committed to helping organizations build strong financial foundations to advance their missions.