Ethel Kremer Schwabacher (May 20, 1903-November 25, 1984) was an abstract expressionist painter, writer, and civil rights activist.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Ethel_Schwabacher

Oedipus at Colonos, Number 2 by Ethel Schwabacher
1959 / Oil and acrylic on linen / 85-1/4″x60-1/4″ / Whitney Museum of American Art, New York

Ethel Schwabacher on Artnet: http://www.artnet.com/artists/ethel-schwabacher/

Further reading:
http://anitashapolskygallery.com/newsite/ethel-schwabacher/
https://www.denverartmuseum.org/en/blog/women-abstract-expressionism-artist-ethel-schwabacher
https://www.nytimes.com/1984/11/26/obituaries/ethel-k-schwabacher-dies-artist-writer-rights-activist.html