Kees Christiaanse studied architecture and urban planning at TU Delft. In 1980 he joined the Office for Metropolitan Architecture (OMA) and was appointed partner in 1983. In 1989 he founded his own company, now KCAP Architects&Planners, in Rotterdam. In 1990 he co-founded ASTOC Architects and Planners in Cologne and was partner until 2002.
Kees focuses in his work on urban assignments in complex situations and on guiding of urban processes. He is an expert in the development of university campuses and in the revitalisation of former industrial, railway and harbour areas and is a supervisor of several international urban developments.
Throughout his career Kees has always combined teaching and research with his professional work within KCAP, which has generated fruitful cross-fertilisations. From 1996 until 2003 he held a professorship for architecture and urban planning at the Technical University of Berlin. From 2003-2018 he has been chair of the Urban Planning Institute of Swiss Federal Institute of Technology (ETH) in Zurich. In 2013, he was appointed Chairperson of the External Advisory Board of the Architecture and Design Department of the Singapore University of Technology and Design (SUTD).
In 2009, Kees was curator of the 4th International Architecture Biennale Rotterdam (IABR) with the title "Open City. Designing Coexistence". He is author of a multitude of books and essays about architecture and urban planning. Kees has received numerous honours among others the lifetime award ‘2016 RIBA International Fellowship’ for his particular contribution to architecture, the 'ARC17 Oeuvre Award' for his lasting and innovative contribution to the improvement of the built environment and the 'ULI Leadership Award 2018' for his special commitment and courage with which he has committed himself to sustainable urban development and a better quality of life in the urban centres of Germany.