
Derek Flanagan
New York-based Grassi & Co. (FY17 net revenue of $60.8 million) announces that the audit nonprofit partners and staff of Lederer Levine & Associates of Lyndhurst, N.J., joined the firm on Jan. 1.
The acquisition brings partner Derek Flanagan as well as four professionals to the firm’s offices in New York and White Plains, N.Y. The addition of these specialist resources has expanded and strengthened services provided by Grassi & Co.’s not-for-profit practice, led by David M. Rottkamp.

David Rottkamp
Flanagan has over 30 years of experience in providing audit and accounting services exclusively to not-for-profit organizations. His clients include social services agencies, private and charter schools, arts organizations, private foundations and special needs providers.
“Lederer Levine & Associates’ nonprofit practice bears significant synergies with our practice,” says Rottkamp. “The years of expertise brought by Derek and his team enhances our existing strengths and will expand our geographic reach in the region, placing us at the forefront in serving the needs of this important segment.”
Grassi & Co.’s not-for-profit practice team assists many types of not-for-profit organizations, including organizations involved in government-funded social services, special needs, health care, philanthropic, religious and education.
“With the increasing demands and challenges facing the not-for-profit community, adding a stronger presence in Westchester County is another way the professionals of Grassi & Co. are growing to meet those challenges, says Louis C. Grassi, CEO and MP. “As our firm looks to the future, we’re excited to continue to expand our footprint in the New York region.