Ruth Armer (May 26, 1896-August 29, 1977) was an American abstractionist painter, lithographer, teacher, and art collector from the San Francisco Bay area in California.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Ruth_Armer
Abstraction #250 by Ruth Armer
c.1950 / Oil on canvas / 24″x20″ / Private collection
Ruth Armer on Artnet: http://www.artnet.com/artists/ruth-armer/