Toni Mazzacca

Toni Mazzacca is a Partner at Grassi, where she focuses on delivering hands-on, boutique-style accounting services while strengthening the firm’s brand and cultivating client relationships. Toni brings nearly 30 years of experience in accounting, with a proven track record of advising multinational corporations, partnerships, and high-profile clients in the financial services sector. Her expertise spans tax strategy, compliance, and consulting, with an emphasis on creating measurable impact for clients.

Throughout her career, Toni has emphasized personalized service and an entrepreneurial approach, preferring environments where she can directly influence client outcomes. She spent 26 years at PwC, where she built a foundation in complex tax matters and global business structures, including guiding Goldman Sachs through their IPO. Following that, she served as a partner at Mazars for approximately 4.5 years until the firm was acquired by Forvis, before transitioning to Grassi to work in a smaller, more agile firm where she can deliver direct, high-value impact for clients.

Toni specializes in tax for the financial services industry and is recognized for her ability to combine technical expertise with strategic insight. Her professional philosophy centers on providing clear, actionable guidance, fostering collaborative client relationships, and driving tangible business results. A committed mentor and thought leader, Toni continues to share her knowledge through client advisory, industry conferences, and internal leadership, helping both clients and colleagues achieve sustainable growth and success.

• Certified Public Accountant (CPA)

• Pace University-Pleasantville/Briarcliff Campus - BBA, Accounting
• Fordham University - MBA, Finance

• AICPA
• New York State Society of CPAs
• Wall Street Tax Association
• Alpha
• LATIP