Pop Fredericks and Dave Campion appear together as Victorian musicians in the 1923 holiday cover, Christmas Trio. Fredericks is the big man on the left.

Though Fredericks never became a renowned actor, he achieved immortality on Post covers: as a seasick ocean voyager, a cellist, a politician, and an obliging physician (above, right) who can’t resist allaying the worries of the little mother. The Doctor and the Doll was an all-time favorite and is one of the most collectible Post covers of all time.