Augusta Savage (February 29, 1892-March 27, 1962) was an American sculptor and a teacher whose studio was important to the careers of a generation of artists.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Augusta_Savage
Gwendolyn Knight by Augusta Savage
1934-35 / Painted plaster / 18 1/2″x8 1/2″x9″ / Seattle Art Museum, WA
Augusta Savage on Artnet: http://www.artnet.com/artists/augusta-savage/