Untitled, 1961
ink on paper

Saul Steinberg (1914-1999). Originally published in The New Yorker, July 29, 1961. © The Saul Steinberg Foundation/Artists Rights Society (ARS), New York.

Steinberg is often referred to as a Romanian-born American illustrator.
Simply, artist, would be a more accurate description.

Steinberg is always a delight. There's not as much of his work online as I would like to see. The Saul Steinberg Foundation is a good place to start, however.