"Form was . . . very important to Jack. In all these works, one can see the formal influences of the early twentieth-century Cubists, and particularly the influence of the California artist, Rico Lebrun.??In technique, there is the influence of Jose Gutierrez and the muralists who were among the first to experiment with Duco paint and pigments suspended in other synthetic media like polyester resin.
[Jack] ". . . had a deep concern for the condition of the common man: but he did not give any outward appearance of pomposity, of phony artistic sensibility . . . ."
Professor of Art, James R.C. Adams