About us:
Grassi is a leading US advisory, tax and accounting firm providing comprehensive services to businesses, individuals and families. With a strong commitment to personalised service, the firm combines the expertise and resources of a nationally recognised organisation with a relationship-driven approach to helping clients achieve their financial and business objectives.
In August 2026, Hoffman Mulligan joined Grassi, bringing decades of experience in tax planning, consulting and compliance. Former managing partners Donald Hoffman and Janet Mulligan continue to serve their clients as Partners at Grassi, maintaining the personal relationships, continuity and proactive advice that have long characterised their practice.
Don Hoffman specialises in domestic and international tax matters, advising businesses and individuals on complex tax requirements, cross-border transactions, entity structuring and international expansion. He has extensive experience supporting German and European businesses entering the US market, helping them navigate federal, state and local tax obligations while developing tax-efficient structures and compliance strategies.
As a founding member of German Business Hub NYC, Don brings valuable expertise to the network, supporting German and European companies and entrepreneurs in establishing and growing their presence in the United States.
Through Grassi, clients benefit from an expanded range of advisory, tax and accounting services while continuing to receive the dedicated, personal attention and long-term guidance they have come to expect.
Address:
Grassi & Co., CPAs, P.C.
360 Madison Avenue
7th Floor
New York
NY 10017
United States
Tel: +1 917-281-9460
Email: DHoffman@grassiadvisors.com
