Doeren Mayhew, the nation’s 47th largest assurance, tax and advisory firm, has made a significant expansion into the Atlanta market with the merging in of AGL CPA Group (AGL), effective as of July 16, 2025.

Deeply connected in the Atlanta community for over 15 years, AGL serves a diverse client base of closely held businesses and high-net-worth individuals with consulting, tax and attestation services. AGL, which now operates under the Doeren Mayhew brand, brought over its 20-plus employees to the firm. Jay Robbins will act as the managing principal in the region, while its other partners Bradley Sienkiewicz, Jim Leutenegger, Justin Bailey and Daniel Cassandra join the firm’s leadership team as principals.

The transaction establishes Doeren Mayhew’s presence in the region with a new Duluth office and strengthens the capabilities of several practice areas, including tax, audit, transaction advisory, CFO advisory, manufacturing, construction, real estate and professional services. Doeren Mayhew will capitalize on AGL’s deep technology, broker dealer and alternative investments sector experience to expand its industry reach.

“Finding the right strategic partner in the Atlanta community was an important part of our vision for growth in the Southeast,” says Chad Anschuetz, CEO at Doeren Mayhew. “AGL’s established presence of reputable work and technical expertise will accelerate our growth trajectory in this pivotal international hub. We are excited to welcome the AGL team to the Doeren Mayhew family, and we look forward to serving the local community with them by our side.”

“We’re thrilled to join Doeren Mayhew. Culture was the most important factor in finding a partner to grow alongside,” said Bradley Sienkiewicz, AGL’s co-founder and managing partner. “Doeren Mayhew shares a common culture of excellence, great people and bullish vision for the future. Combining forces seems like a natural progression for AGL. It gives us the dynamic platform to provide expansive resources and solutions to our clients, while providing unparalleled career opportunities to our team.”

Alan D. Koltin, CEO of Koltin Consulting Group, who advised both firms on the combination commented, “Expanding into the Atlanta market was a high priority for Doeren Mayhew, and they found the perfect firm in AGL! AGL is young, entrepreneurial and has a great reputation in the technology space. Doeren Mayhew has had significant success in executing on its M&A and lateral talent strategies.”

Doeren Mayhew’s robust growth strategy is fueled by augmenting its technical and industry expertise and expanding its geographic footprint to thriving U.S. markets. AGL marks the firm’s sixth addition in 2025. The firm recently deepened its resources in the Houston and West Michigan regions with the acquisitions of Reimer McGuinness Hess CPAs and Advisors, Vanessa Solá’s practice of Frierson, Solá, Simonton & Kutac, PLLC, Benoit & Associates CPAs and Draper Bialik & Company CPAs. In March 2025, the firm expanded to Nashville via the acquisition of Thurman Campbell Group, PLC.