Derek Flanagan

Derek Flanagan, CPA


Derek Flanagan, CPA, Partner, Not-For-Profit Services, has over 30 years of experience providing audit and accounting services exclusively to not-for-profit organizations. Derek's clients include social services agencies, private and charter schools, arts organizations, private foundations and special needs providers. He has given lectures before the New York Society of Association Executives, the Inter-Agency Council of Mental Retardation and Developmental Disabilities and the New York Society of Certified Public Accountants (NYSCPA).



Grassi & Co.’s Not-For-Profit Practice Expands in NYC and Westchester County

Leading accounting, tax and advisory firm, Grassi & Co., announced today that the audit nonprofit partners and staff of Lyndhurst, NJ-based Lederer, Levine & Associates have joined the firm, effective January 1, 2019. 

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    BBA, Manhattan College.


    American Institute of Certified Public Accountants (AICPA)

    New York State Society of Certified Public Accountants (NYSSCPA)

    New Jersey Society of Certified Public Accountants (NJSCPA), Society’s Not-For-Profit Organizations and Exempt Organization Committees

    Past-Chair for the Society's Not-For-Profit Organizations and Public Sector Oversight Committees
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