Callison Employee Directory
Architecture and PlanningWashington, United States201-500 Employees
Callison has about 330 employees across 3 continents, most of them in North America. By country, the largest groups are United States Of America (70%), China (25%) and Mexico (2%). Arts & Design and Business make up over half of the profiles with a known department. Callison's workforce spans 11 departments. Callison's workforce fell 36% between July 2025 and July 2026.