Born Morris Kusnetzov in New York, Morr Kusnet (1908 – 1990) was a commercial artist who provided newspapers with portraits of film stars.
By 1935, Morr was doing magazine covers , and as late as 1963, he did a cover of Carol Burnett for TV Guide.
Here are some examples of his work. There was mention on pulp artists.com of a charcoal drawing he did of the 12 ANGRY MEN, but I haven’t been able to find a copy.
I’m not sure if he was ever employed by any of the studios , or just freelanced.
A fine artist.