According to Wikipedia,
Grace Hartigan was an American Abstract Expressionist painter and a significant member of the vibrant New York School of the 1950s and 1960s. Her circle of friends, who frequently inspired one another in their artistic endeavors, included Jackson Pollock, Larry Rivers, Helen Frankenthaler, Willem and Elaine de Kooning and Frank O'Hara. Her paintings are held by numerous major institutions, including the Museum of Modern Art in New York City. As director of the Maryland Institute College of Art's Hoffberger School of Painting, she influenced numerous young artists.
Grace Hartigan is affiliated with the following schools: