Dia Art Foundation is a nonprofit organization that initiates, supports, presents, and preserves art projects. It was established in 1974 by Philippa de Menil, the daughter of Houston arts patron Dominique de Menil and an heiress to the Schlumberger oil exploration fortune; art dealer Heiner Friedrich, Philippa's husband; and Helen Winkler, a Houston art historian. Dia provides support to projects "whose nature or scale would preclude other funding sources." Dia holds a major collection of work