Loren MacIver (February 2, 1909-March 3, 1998) was an American painter and the first woman represented in MoMA’s permanent collection.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Loren_MacIver

Downstairs by Loren MacIver
c.1936-1939 / Oil on canvas / 30 1⁄4″x20 1⁄8″ / Smithsonian American Art Museum, DC

Loren MacIver on Artnet: http://www.artnet.com/artists/loren-maciver/

Further reading:
https://www.alexandregallery.com/loren-maciver
https://www.pafa.org/museum/collection/item/oil-slick
https://www.nytimes.com/1998/05/24/nyregion/loren-maciver-90-a-painter-known-for-her-eclectic-style.html