Rem Koolhaas and 5 other partners are behind the Office for Metropolitan Architecture (OMA), one of the leading architectural partnerships in the world. A while back I did a post about the Prada lookbook which is art directed by OMA. They also do the show production for the Prada group as well as exhibitions and installation projects.
A recent one is the Transformer in Seoul, South Korea. A temporary space that can literally be rotated onto different sides of itself to convert its purpose. You can view more pictures of the Transformer and other projects on the OMA website and on the Prada Transformer blog.