A pioneer of earthworks and public art, Nancy Holt also worked in sculpture, installation, film, video, and photography for over three decades. She is best known for her large-scale environmental sculptural works, including Sun Tunnels in Utah and Dark Star Park in Virginia. In the late 1960s and early 1970s, Holt made a series of pioneering film and video works, including several collaborations with Robert Smithson. Holt's early videos explore perception and memory through experiments with point of view and process.