HDR is an international design firm founded by H H Henningson in 1917, with Willard Richardson joining in the 1930s and Chuck Durham joining in 1940. The company specialises in engineering, architecture, environmental and construction services.

The firm employs over 10,000 staff that work across 13 countries , including architects, engineers, scientists, builders, analysts and artists. Headquartered in Omaha, USA, the company has over 200 offices across the US, Canada, Australia, China, India, Singapore, Denmark, Germany, the UK, Qatar, Saudi Arabia and the UAE.