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Doeren Mayhew Enters New York Market via 1RDG
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Subscribe04 FEB 2026 / M&A UPDATES
Accounting firm Doeren Mayhew has made its first acquisition of 2026, entering the New York market through the purchase of advisory firm 1RDG. The move expands Doeren Mayhew's presence in the northeast and adds to its capabilities and industry expertise; further partner firms will also be joining concurrently, bringing in over 100 employees and seven new partners.
Doeren Mayhew has announced its entry into the New York market through the acquisition of 1RDG, a Rochester, New York based advisory firm, effective January 20. The transaction marks the firm’s first acquisition of 2026 and expands its geographic and advisory footprint in the Northeast.
Founded in 2005 by John Rizzo and Brian DiGiacco, 1RDG evolved from a boutique accounting firm into a regional advisory platform providing compliance, management, and advisory services. The combination adds two New York offices for Doeren Mayhew and strengthens capabilities across audit, tax, and outsourced accounting, while expanding industry expertise in construction, health care, real estate, manufacturing, and private family offices.
In advance of the transaction, 1RDG partnered with Bailey Carr CPAs in Rochester and Bahgat and Laurito Bahgat CPAs in Fredonia to further expand its presence. Those firms are joining Doeren Mayhew concurrently, bringing more than 100 employees and seven partners. Brian DiGiacco, Cory Raggi, Christopher Gamble, Timothy Hern, Ryanlynn McCollum, and Lori Jansen will join as partners, while John Rizzo will continue to lead the New York region as managing principal.
The acquisition builds on Doeren Mayhew’s continued national expansion and follows a year of significant growth, during which the firm completed multiple acquisitions across key U.S. markets.
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