Was Paul Klee famous at all?

Answer 1

Yes, he was and is famous.

You probably wouldn't have heard of him if he wasn't considering that he died in 1940.

Paul Klee is famous not only for creating many paintings and drawings but also for writing books on color theory, on form, and on design theory. His writings are considered essential reading to understanding modern art.

He is associated with "the blue rider" group where he had contact with other famous artist.