Cornelis Ruhtenberg (November 18, 1923-2008) was an American artist known for Abstract figure, portrait, and still-life painting. In 1956, Cornelis Ruhtenberg married the American painter Jules Kirschenbaum.
Biography on Wikipedia (Google translation from German): https://bit.ly/30xdwol
Self-Portrait by Cornelis Ruhtenberg
ND / Oil on wooden panel / 12″x10-2/5″ / Private collection
Cornelis Ruhtenberg on Artnet: http://www.artnet.com/artists/cornelis-ruhtenberg/
Further reading:
https://americanart.si.edu/artist/cornelis-ruhtenberg-4183
https://www.askart.com/artist/Cornelis_Ruhtenberg/101602/Cornelis_Ruhtenberg.aspx
https://ufdc.ufl.edu/UF00080808/00001/thumbs
The Misty Miss Christy 