For instance, David Apatoff in this post, "Who Are All These Illustrators?" included Gotlieb with others who were competent, yet obscure even to him. And David is an illustration uber-maven!
Which is probably why very little of Gotlieb's work can be found on Internet searches. Below are most of his images that I came across.
Gootlieb's theme of a beautiful woman and a small car is a continuation of a cover theme from as early as a 1924 cover by Coles Phillips.
Something is wrong with her face.
Vignette and page layout.
Glamorous ancient Egyptians.
Via National Museum of American Illustration's Facebook page. It looks like a Mead Schaeffer painting, but the collection doesn't include this image, according to their Web page. And Gotlieb is not listed as an artist in the collection. For now, let's call this illustration a "maybe."