olliers Engineering & Design is pleased to announce the successful rebranding and full integration of Terra Consulting Group, an Illinois‑based engineering firm specializing in wireless and infrastructure design services. Colliers Engineering & Design acquired Terra Consulting Group in May 2025, and effective immediately, the firm will operate under the Colliers Engineering & Design brand.  

This strategic partnership strengthens Colliers Engineering & Design’s position in the telecommunications market, expands its national footprint, and enhances its ability to deliver innovative, end‑to‑end solutions to clients across the public and private sectors. 

“Bringing Terra Consulting Group under the Colliers Engineering & Design brand marks an exciting step forward in uniting complementary strengths to better serve our clients,” said John J. Zimmermann, Senior Manager, Business Development, who previously served as President of Terra Consulting Group. “This integration enhances our ability to deliver end-to-end solutions, particularly in the wireless and telecommunications space, while expanding our reach and deepening our impact nationwide.” 

“Together, we are well-positioned to drive growth, elevate service delivery, and create even greater value for our clients and partners,” added Thomas A. Zimmermann, PE, Geographic Discipline Leader, Telecommunications, who formerly served as Vice President of Terra Consulting Group. 

“Completing the rebrand to Colliers Engineering & Design is a major step in our growth strategy, representing the momentum we’re building together, said Kevin L. Haney, PE, President & CEO, Colliers Engineering & Design. “This transition expands our footprint in the ever‑evolving telecommunications industry and reinforces our commitment to delivering innovative, future‑focused solutions.” 

The addition of Terra Consulting Group brings a unique perspective and specialized expertise to Colliers Engineering & Design’s Telecommunications Discipline. The combined team strengthens the firm’s scale, capabilities, and commitment to providing cutting‑edge, multi‑discipline services nationwide.