RTKL was a global architecture, planning and design firm. The firm was founded in 1946 by Archibald C. Rogers and Francis T. Taliaferro in Rogers’ grandmother’s basement in Annapolis and grew to be one of the largest architectural firms in the world prior to its acquisition by Arcadis NV in 2007. In October 2015, RTKL was formally merged with another Arcadis subsidiary, Seattle-based Callison, to form CallisonRTKL headquartered in Baltimore.

Arcadis NV is a global design, engineering and management consulting company based in the Zuidas, Amsterdam, Netherlands. It currently operates in excess of 350 offices across 40 countries. The company is a member of the Next 150 index.