Tacha is a multimedia visual artist. She is best known for her work in the fields of environmental public sculpture and conceptual art, and she also works with photography, film, and artists’ books. Tacha’s work is interested in creating personal narratives, and often plays with geometry and form. One of the first artists to develop environmental site-specific sculpture in the early 1970s, Tacha has won over fifty competitions for permanent public art commissions, of which nearly forty have been executed throughout the U.S., including an entire city-block park in downtown Philadelphia, Pennsylvania.

Tacha received an M.A. in sculpture from the Athens School of Fine Arts in Greece; an M.A. in art history from Oberlin College, Oberlin, Ohio; and a Doctorate in aesthetics from the Sorbonne in Paris (1963). After her studies, she worked as the curator of modern art at the Allen Memorial Art Museum of Oberlin College, organizing contemporary art exhibitions (including Art In The Mind, 1970). She has published two books and various articles on Auguste Rodin, Brâncu?i, Nadelman and other 20th-century sculptors. She married art historian Richard E. Spear in 1965. From 1973 to 2000, she was a professor of sculpture at Oberlin College. Since 1998, she has been an affiliate of the University of Maryland, College Park, and lives in Washington, DC