Vivian E. Browne (April 26, 1929–July 23, 1993) was an African-American artist, activist, and professor known for her sociopolitical portraits and abstracted paintings.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Vivian_E._Browne

Mother by Vivian Browne
1961 / Oil on canvas / 42-1/2″x36-3/4″ / Ryan Lee Gallery, NYC

Vivian Browne on Artsy: https://www.artsy.net/artist/vivian-browne/works-for-sale

Further reading:
https://maryryangallery.com/artists/vivian-browne/
https://wsimag.com/art/50857-vivian-browne
https://www.artandeducation.net/announcements/214768/acts-of-art-and-rebuttal-in-1971