With 17 years of public accounting experience, Marissa Williams, CPA, CFE serves as an Assurance Partner at Atherton & Associates, where she leads complex audit and assurance engagements for nonprofit organizations and closely held businesses. She works with clients across the agriculture, healthcare, construction, manufacturing, and nonprofit sectors, helping organizations navigate financial reporting requirements, strengthen internal controls, and maintain confidence in their financial operations.
Marissa is known for combining technical expertise with a practical, solutions-focused approach. Clients value her precision, responsiveness, and ability to bring clarity to complex financial environments while providing strategic guidance tailored to their organization’s goals. Whether overseeing audits, advising leadership teams, or supporting long-term operational planning, she serves as a trusted advisor who prioritizes transparency, insight, and proactive communication.
In addition to leading assurance engagements, Marissa plays an active leadership role within the firm. She helps guide the assurance department, contributes to the firm’s overall strategic planning initiatives, and supports internal technology and IT-related operations that help strengthen firm efficiency and client service.
Marissa is committed to helping clients build stronger organizations through thoughtful guidance, reliable assurance services, and long-term professional relationships.
