The Office for Metropolitan Architecture (OMA) is a leading international partnership practicing contemporary architecture, urbanism, and cultural analysis.   The office is led by six partners – Rem Koolhaas, Ole Scheeren, Ellen van Loon, Reinier de Graaf, Shohei Shigematsu and Managing Partner, Victor van der Chijs – and employs a staff of around 220 of more than 35 nationalities. Architects, researchers, designers, model makers, industrial designers and graphic designers work in close collaboration, and expert consultants are intimately involved from the beginning of the design process.   OMA's recently completed projects include Prada Transformer, a rotating multi-use pavilion in Seoul (2009), the Zeche Zollverein Historical Museum and masterplan in Essen (2006), the Seoul National University Museum of Art (2005), the much acclaimed Casa da Música in Porto (2005), the Prada Epicenter in Los Angeles (2004), the Seattle Central Library (2004), the Leeum Samsung Museum of Art in Seoul (2004), the Netherlands Embassy in Berlin (2003), the IIT Campus Center in Chicago (2003), and the Prada Epicenter in New York (2001).   The work of Rem Koolhaas and OMA has won several international awards including the Pritzker Architecture Prize in 2000, the Praemium Imperiale (Japan) in 2003, the RIBA Gold Medal (UK) in 2004 and the Mies van der Rohe – European Union Prize for Contemporary Architecture (2005).   To accommodate a range of projects throughout the world, OMA maintains offices in Europe (OMA*AMO Rotterdam), North America (OMA*AMO Architecture PC New York), Asia (OMA Beijing). OMA also recently established an office in Hong Kong for its work on several projects in the region.