Guernsey

Founded in 1928, Guernsey is a multidisciplinary design and consulting firm based in Oklahoma City, Oklahoma, and with work across five continents. With a legacy of delivering innovative solutions across diverse industries, Guernsey is committed to advancing sustainable practices and enhancing the built environment. Guernsey is 100% owned by its people, passionately entrepreneurial, and culture-driven. Guernsey’s services span architecture, engineering, economic and management consulting, environmental and transportation planning, and cybersecurity solutions—reflecting the firm’s belief that integrated expertise leads to stronger, more enduring outcomes.