Rem Koolhaas founded OMA in 1975 together with Elia and Zoe Zenghelis and Madelon Vriesendorp. OMA is a leading international partnership practicing architecture, urbanism, and cultural analysis. Koolhaas heads the work of both OMA and AMO, the research branch of OMA, operating in areas beyond the realm of architecture such as media, politics, renewable energy and fashion.