Dimitrije Bašičević, also known as Mangelos, was a pivotal Yugoslavian art historian among the founders of the Gorgona Group. He studied art history and philosophy in Vienna and Zagreb, later working as a curator and art critic. In 1971, Mangelos became Chairman of the Center for Film Photography and Television, part of the Museum of Contemporary Art in Zagreb. He organized numerous exhibitions in Croatia and abroad, contributing to conceptual and constructive art growth in eastern Europe. His artworks, often composed of letters, symbols, and numbers, were usually exhibited anonymously within the Gorgona Group. He took part in the organization of New Tendencies exhibitions and joined the Group of Six Artists in 1975. Mangelos’s works have been presented in numerous international galleries and museums, including the Kunsthalle Fridericianum in Kassel and the Carnegie Museum of Art in Pittsburgh, Pennsylvania (2004). Other significant group exhibitions were held at the Haus der Kulturen der Welt in Berlin (2008), the Centre Pompidou in Paris (2010), and The Museum of Modern Art in New York (2011).