IESE Business School is a Catholic graduate business school at the University of Navarra. It was established in Barcelona in 1958 by Opus Dei. From 1963, in collaboration with Harvard Business School, it offers a two-year Master of Business Administration degree, an executive MBA, and executive education courses. It has other campuses in Madrid, …IESE Business School is a Catholic graduate business school at the University of Navarra. It was established in Barcelona in 1958 by Opus Dei. From 1963, in collaboration with Harvard Business School, it offers a two-year Master of Business Administration degree, an executive MBA, and executive education courses. It has other campuses in Madrid, Munich, New York City and São Paulo.