Teun Koolhaas was born in Singapore, where his father, Rem Koolhaas, worked as a shipbuilding engineer. When Southeast Asia was occupied by Japan, Teun and his mother were imprisoned in Tjideng camp in Batavia. After the end of the Japanese occupation of Indonesia, the family was reunited, and they moved to Hong Kong. In 1955 Koolhaas returned to the Netherlands to complete his secondary education. He then went on to study engineering at the Technical University of Delft, where he attended lectures by artists including Gerrit Rietveld and Cornelis van Eesteren. After graduating in 1967 Koolhaas continued his studies at Harvard University and MIT in the United States. At Harvard, he earned a degree in urban planning.
In 1969 Koolhaas returned to the Netherlands, where he went to work for the architectural firm, Environmental Design SA. Among other things he designed the dentistry school building at the University of Utrecht in the Uithof complex. Today, the departments of biology and pharmaceutical sciences are located there. The official name is the F.A.F.C. Went Building (after the botanist Frits Went).
In 1972 Koolhaas began working for the National Office for the IJsselmeer Polders (RIJP). As part of a team of architects, urban planners, sociologists, traffic planners and landscape architects, Koolhaas played an important role in creating the master plan for the new city of Almere in the south island of Flevoland, and was responsible for its urban design.
In 1981 Koolhaas left the Almere project and moved to the regular organization of the RIJP, where he was involved in the design of Zeewolde, and made designs for Markerwaard, a polder that was never built.
In 2003, suffering from cancer, Koolhaas left TKA but continued working almost until his death in October 2007; he was commissioned by the municipalities of Almere and Amsterdam to design the new town Almere Pampus.
- 1967–1969: Harkness Fellowship of the Commonwealth Fund, New York
- 1970: Grand Prix International d’Urbanisme et d’Architecture’, Cannes, France
- 1984: Second Prize (of 198 participants) in the Oosterdock urban design competition
- 1985: Gepremieerd ontwerp voor een experimenteel woonhuis in de ontwerpprijsvraag De Fantasie’, bekend als ‘Polderblik’ te Almere
- 1991: First Prize design competition Gross Glienicke near Berlin, urban planning and construction of 105 homes
- 1994: First Prize design competition Central Zone Amsterdam Noord
- 1999: The Island Neighborhood in Almere Buiten was named best housing estate by the Netherlands ministry of housing, planning and environment
- 2000: First Prize design competition Westerdok Amsterdam (school and residential building)