Before his time -- the late 1940s and the 1950s -- the quality of comic book art was generally mediocre. Perhaps some of that was due to the large number of separate images required for, say, a six-page story. Production speed was and is an important economic concern in that field. But during the 1930s there emerged examples of well done art in newspaper comic strips. Examples include "Tarzan" by Hal Foster and Burne Hogarth, "Terry and the Pirates" by Milton Caniff, and Alex Raymond's "Flash Gordon."
Krigstein and some others upped comic book artistic quality as well as experimented with the means of presentation of sequential events.
His training and inclinations along with clashes with comic book editors and publishers caused him to drift into general illustration and then to teaching art while doing painting on the side.
In comic book / sequential graphic novel world, his work is highly regarded and honored for its quality, innovation and versatility. Some examples are presented below.