Heiner Friedrich (born April 14, 1938 in Stettin) is an art dealer and collector of minimal art and conceptual art. Friedrich and his then wife Philippa de Menil, together with Helen Winkler, established the Dia Art Foundation in 1973. Friedrich has exhibited works by Blinky Palermo, Walter De Maria, Donald Judd, La Monte Young, Andy Warhol, Michael Heizer, and Joseph Beuys, among others in his galleries in Germany, but became less interested in short term gallery installations and through Dia began to collect, and support major projects, such as Walter De Maria's The Lightning Field (1977) in New Mexico and purchasing a former military base in Marfa, Texas to enable Donald Judd to create a permanent space for the installation of his large minimal sculptures.