About Guernsey

Guernsey is a well-established firm with more than 95 years of experience in engineering, architecture, and consulting. If you examine us closely, you might only see the component pieces. But if you look at the bigger picture, you see a unique, cohesive, employee-owned firm capable of handling a wide array of projects, private or public, with a client-first commitment.

We are a multi-discipline firm, employing engineers, architects, planners, consultants, environmental scientists, designers, analysts, accountants and managers. Our clients include federal, state and local government; military entities; utilities; Native American tribes; universities; Fortune 500 companies; oil and gas companies; and more. Because we offer all these services under one roof, we are able to collaborate efficiently, giving you access to expert advice in a variety of disciplines and business sectors.

Learn About the Markets Guernsey Serves



Urban communities have changed significantly since we began working with them in 1928. Quaint downtowns have given way to mass retailers and reverted to being quaint again, traffic is diverse...


Tribal Government

Oklahoma’s history reflects a strong relationship with Native Americans. The economy of Oklahoma is fortified with a variety of Native American business enterprises. We have witnessed first-hand the development of Native American tribes into economically strong, sovereign nations with a...


Oil & Gas

There is no typical day in the oil and gas industry. Things can change overnight – and often do. Leaders in the field must make decisions to meet changing energy...


Power & Energy

Guernsey has a long history in the performance of projects related to power and energy. Our understanding of and passion for the systems and facilities related to power transmission and...


Sports & Entertainment

And we’re here to make sure that doesn’t happen. Today’s sports and entertainment venues are some of the most technologically innovative and security-focused venues in the world – and Guernsey...