Troy, Mich.-based IPA 100 firm Doeren Mayhew (FY24 net revenue of $170.37 million) has entered the New York market through the acquisition of 1RDG, a Rochester, N.Y.-based advisory firm, effective Jan. 20. The acquisition marks Doeren Mayhew’s first transaction of 2026. 
Founded in 2005 by John Rizzo and Brian DiGiacco, 1RDG evolved from a boutique accounting firm into a regional advisory platform offering compliance, management and advisory services. The combination adds two New York offices for Doeren Mayhew and expands advisory capabilities across audit, tax and outsourced accounting, while strengthening industry expertise in construction, health care, real estate, manufacturing and private family offices.
“What made this opportunity stand out wasn’t just the market, it was the people,” said Chad Anschuetz, CEO of Doeren Mayhew Advisors LLC. “The 1RDG team thinks like entrepreneurs and serves clients the way we do. Entering New York became a natural next step in our growth journey, and we’re excited to partner with such a talented team.”
In the months leading up to the transaction, 1RDG partnered with Bailey Carr CPAs in Rochester and Bahgat & Laurito-Bahgat CPAs in Fredonia to expand its footprint. Those firms are joining Doeren Mayhew concurrently, bringing more than 100 employees and seven partners, including DiGiacco, Cory Raggi, Christopher Gamble, Timothy Hern, Ryanlynn McCollum and Lori Jansen. Rizzo will continue leading the New York region as managing principal.
“1RDG has long been known as a firm that embraces growth and change,” said Rizzo. “As the profession transforms, the timing was right to join a forward-thinking firm like Doeren Mayhew. The cultural alignment and opportunity were clear from the start.”
Allan D. Koltin, CEO of Koltin Consulting Group, who advised 1RDG on the combination, said the firm’s entrepreneurial mindset and client-focused approach made Doeren Mayhew a strong fit as a long-term platform for growth.
With nearly 1,000 professionals across 23 offices, the acquisition builds on Doeren Mayhew’s rapid expansion following 13 acquisitions completed in 2025, including entries into Nashville, Atlanta and Miami.
