Celebrating Cardno’s long-term employees and influencers: Richard Callahan


​In 1977, a group of like-minded graduate students set up an environmental firm specialising in wildlife, wetlands, and water resources consulting in Tampa, Florida. One of those graduates is one of Cardno’s leading ecologists, Richard Callahan; today, Strategic Director, Land and Natural Resource Management with Cardno Americas’ Natural Resources Health Sciences (HRHS) Division.

Richard’s company Biological Research Associates (BRA) merged with ENTRIX in 2007, which was then acquired by Cardno in 2010.

“Being part of the team that brought together a unique set of professionals and support staff that became a highly respected regional environmental consulting firm was a career highlight,” says Richard.  Progressing that firm into a highly respected national firm, ENTRIX, and eventually an equally impressive international company, Cardno, he says, compounds his satisfaction. However, he credits working with his partners and colleagues as the best rewards of his career.

Since the merger with ENTRIX, and continuing today, Richard has been responsible for the continued expansion of Cardno’s business position and proposition in the Americas. He has held positions such as CEO and President of BRA, and has been a member of the ENTRIX and Cardno ENTRIX Board of Directors since 2007.

However, it’s the hands-on work that keeps Richard at the top of his game in his industry, and a true example to the people he works alongside. He states the relatively recent Nicodemus Slough Dispersed Water Project (see below) as a personal and professional highlight.

Another highlight he mentions is being proud of the effort, execution and intellectual prowess the company brought to bear in addressing the Natural Resource Damage Assessment of the MC 252 Deepwater Horizon oil spill in the Gulf of Mexico, beginning in 2010.

“Nearly every aspect of the company at the time was needed to mobilize, organize and design a program to address the prolonged dynamic developments that became the ‘norm’ throughout the life of the project,” he says. The project came at a high cost of time and commitment for hundreds of staff members, however, he notes everyone handled the unprecedented and awesome challenge in a most professional and skilled manner.

Richard has been witness to Cardno’s evolution, especially over the past five years. He has seen in his industry, environmental and health sciences, that Cardno has progressed into an international firm with a diversified approach to addressing and enhancing the human condition and the environment.

“I am encouraged and impressed by the tenacity and durability of the components that comprise Cardno today, and I look forward to our continued development and the fostering of our most important asset, our dedicated and talented staff.”

Contact Cardno

Richard J Callahan Jnr
Phone: +1 813 367 0952


Nicodemus Slough Dispersed Water Project, Glades Country, Florida USA

One of Richard’s personal project highlights is being involved in the Nicodemus Slough Dispersed Water Project. Cardno provided environmental, ecological, natural resource economics, engineering, geotechnical and cultural resource services for the design, permitting and construction of the project.

This regionally significant project is a public/private collaboration to enhance, restore and create surface waters and wetland systems on a privately-owned cattle ranch in the Everglades Region of Florida. The driving principle is to support the Everglades Restoration and the enhancement of the Caloosahatchee River Watershed and associated estuary.

The project is the development of a surface water management system that employs low head berms, flow control structures and a high volume pump system that delivers surface water from Lake Okeechobee to the higher elevations of the ranch. This design is to facilitate surface water sheet flow across the ranch to restore hydro periods and enhance water quality through nutrient uptake on the ranch and adjacent properties. Historic flows and habitats had been altered by decades of man-made flood control and drainage.

The primary benefits are to the downstream resources of the Everglades and the Caloosahatchee River and to the several endangered and threatened wildlife species present on the property.