I was approached by a writer from the Netherlands who was inquiring about Jack O'Brien who did artwork for the longrunning "Sad Sack" title for a number of years. His stories tended to follow the format of Sad Sack getting knocked on the head with some object and then having an extended dream sequence. O'Brien also created "G.I. Juniors" for Harvey and signed his name to it.
Any information that anyone may have will be helpful!