CallisonRTKL
| Industry | Architecture | 
|---|---|
| Area served | Worldwide | 
| Key people | Kim Heartwell (CEO) | 
| Number of employees | 800 | 
| Website | www | 
CallisonRTKL is a global architecture, planning and design firm formed from the October 2015 merger of Callison and RTKL Associates, both of which were subsidiaries of Arcadis NV.