About Us

Our team believes that honesty, hard work and determination hold the keys to success and follow these principles when helping clients unlock their potential for success.


It all started in 1980 with an empty file cabinet, a desk and a savvy businessman named Lou Grassi, who possessed a keen insight into the necessary components of success. After more than a quarter century, Grassi & Co. is now one of the nation's elite accounting firms and among the Top 100 largest firms in the United States.  Also ranked by Crain's New York Business as one of the Top 20 largest accounting firms in New York and by Long Island Business News as one of the Top 5 largest on Long Island, Grassi & Co. is a full-service tax, accounting, and business advisory firm with offices throughout Long Island, NY, in Manhattan, NY, New Jersey, Westchester County and Rome, Italy.
 
We provide more than traditional accounting, auditing and tax services. We thrive on solving problems, reducing tax liabilities, easing the financial audit process, managing and planning for growth, and preparing for the future. We have been recognized nationally as one of the Best Places to Work by Best Companies Group and have been named among the Top 25 “Best of the Best Firms” by INSIDE Public Accounting for twelve years.

Grassi & Co. is an independent member firm of Moore North America, which is itself a regional member of Moore Global Network Limited (MGNL). All the firms in MGNL are independent entities, owned and managed in each location. Their membership in, or association with, Moore Global Network Limited should not be construed as constituting or implying any partnership between them.