Doeren Mayhew acquires 1RDG | Accounting Today

Doeren Mayhew acquired Rochester, New York-based advisory firm 1RDG, as of Jan. 20, 2026.

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The deal marks the Top 50 Firm’s entrance into the New York market with two new offices. 1RDG brings its advisory expertise to the firm, strengthens core services in audit, tax and outsourced accounting, and deepens insight across shared sectors like construction, health care, real estate, manufacturing and private family offices. Terms of the deal were not disclosed.

Based in Troy, Michigan, Doeren Mayhew ranked No. 47 on Accounting Today‘s 2025 Top 100 Firms list. The addition of 1RDG is the firm’s first transaction of 2026 and adds $20 million to Doeren Mayhew’s $245 million in revenue. The firm now has over 1,000 employees and nearly 155 principals.

In the months leading up to the transaction, 1RDG partnered with Bailey Carr CPAs in Rochester, and Bahgat & Laurito-Baghat CPAs in Fredonia, New York, to expand its presence. Both firms join Doeren Mayhew concurrently, adding over 100 employees and seven partners.

“What made this opportunity stand out wasn’t just the significant market, it was the people,” Chad Anschuetz, CEO at Doeren Mayhew Advisors, said in a statement Tuesday. “The 1RDG team thinks like entrepreneurs and serves clients the way we do. 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.”

Doeren Mayhew received a private equity investment from Audax Private Equity in August 2024, with a goal to grow its geographic footprint through continued acquisitions. In 2025, the firm completed 13 deals, expanding into markets such as Nashville, Atlanta and Miami.

“As our industry undergoes rapid transformation, the timing couldn’t be better to join a forward-thinking, historic firm like Doeren Mayhew,” John Rizzo, managing partner of 1RDG, said in a statement. “From our very first meeting with their team, it was clear the culture and opportunity were the perfect fit. We are excited to deliver expanded resources to our clients and an even stronger growth path for our people.”

1RDG was founded in 2005 by Rizzo and Brian DiGiacco as a boutique accounting firm. It provides compliance, management and advisory services to clients across Upstate New York.

Allan Koltin, CEO of Koltin Consulting Group, who advised 1RDG on the deal, said: “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.”