High Quality Content by WIKIPEDIA articles! Kees Christiaanse (b. 1953, Amsterdam) is an architect and urban planner from the Netherlands. After working with Rem Koolhaas, he started two firms, Kees Christiaanse Architects & Planners (KCAP, in Rotterdam) in 1989 and Architects and Planners (ASTOC, in Cologne) in 1990, where he was a partner till 2002. Christiaanse has "tackled some of the highest profile urban design schemes in the Netherlands, hosting buildings by" the finest Dutch and several international architects.