Top 50 accounting firm Doeren Mayhew has entered the New York market through the acquisition of 1RDG, a Rochester-based advisory firm, effective Jan. 20.
Financial terms of the deal weren’t disclosed.
With nearly 1,000 professionals across 23 offices, this marks Doeren Mayhew’s first M&A deal of 2026, and builds on the firm’s rapid growth strategy, following 13 acquisitions completed last year that enhanced current hubs and expanded its presence into new markets, including in Nashville, Atlanta, and Miami.
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The Troy, MI-based accounting firm received an infusion of outside capital in August 2024 by selling a stake to Audax Private Equity.
Doeren Mayhew said at the time that the investment will allow it to broaden its geographic footprint via continued acquisitions, as well as to enhance its service offerings, technology infrastructure, and overall employee and client experience.
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Doeren Mayhew says the acquisition of 1RDG expands its presence into the New York market with two new offices, while adding new advisory expertise. Both firms benefit from increased depth in core services, including audit, tax, and outsourced accounting, as well as expanded industry insight across shared focus sectors, such as construction, health care, real estate, manufacturing, and private family offices, officials say.
“What made this opportunity stand out wasn’t just the significant market, it was the people. The 1RDG team thinks like entrepreneurs and serves clients the way we do,” Chad Anschuetz, CEO at Doeren Mayhew Advisors, said in a statement on Feb. 3. “While New York surfaced as a unique opportunity along our growth journey, it is one that became a very natural next step for us. We’re excited to partner with such a talented team while continuing to build and strengthen the trusted relationships 1RDG, and its counterparts, have cultivated across the market.”
Founded in 2005 by John Rizzo and Brian DiGiacco as a boutique accounting firm, 1RDG brings compliance, management, and advisory services together in one integrated platform.
In the months leading up to the transaction, 1RDG partnered with Bailey Carr CPAs in Rochester and Bahgat & Laurito-Bahgat CPAs in Fredonia, NY, to expand its presence. The firms join Doeren Mayhew concurrently, bringing more than 100 employees and seven partners, including DiGiacco, Cory Raggi, Christopher Gamble, Timothy Hern, Ryanlynn McCollum, and Lori Jansen, as well as Rizzo who will continue leading the firm’s New York region as managing principal.
“1RDG has long been known as ‘The Hustle Firm,’ always embracing growth, change, and the push to get outside our comfort zone. As our industry undergoes rapid transformation, the timing couldn’t be better to join a forward‑thinking, historic firm like Doeren Mayhew. From our very first meeting with their team, it was clear the culture and opportunity were the perfect fit,” said Rizzo, managing partner of 1RDG. “We are excited to deliver expanded resources to our clients and an even stronger growth path for our people.”
Allan D. Koltin, CEO of Koltin Consulting Group, who advised 1RDG on the combination, commented, “I don’t recall seeing a firm as diverse and entrepreneurial as 1RDG in some time. Their firm wasn’t built around delivering tax returns and financial statements but rather on how to solve their client’s business and financial problems and challenges. They felt Doeren Mayhew was the perfect culture and platform for them and had a similar approach to serving clients. In the last year, Doeren Mayhew has grown dramatically and more importantly has become a ‘destination place’ for high-performing talent.”
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