"[1] Following his death, The Comics Reporter described him as having had "one of the most prolific and successful [cartooning] careers of the late 20th Century.
"[2] Caldwell never received any actual training as a cartoonist, but he attended the Parsons School of Design, where his general art education helped him prepare for a cartooning career.
He wrote and drew a gag front cover depicting the mascot Alfred E. Neuman having taken a wrong turn away from the New York Marathon route, jogging into a murder scene, and cluelessly breaking through yellow crime scene tape in triumph.
The joke which depicted downtown Manhattan and a dead body was no longer appropriate in light of the real world events.
A replacement cover was swiftly produced, showing a closely cropped head shot of Neuman, his trademark tooth gap filled in by a small American flag.