Jeb Wormwood is a villager of Witchaven. Like most of the other Witchaven villagers, he succumbs to sea slug control after Slug Menace. If you haven't started the quest, he will simply say "Hello there!".
However, this decision is once again reversed after Salt in the Wound, where the Mayor, free from the mind-controlling properties of the sea slugs, returns the boat back to Holgart. Also, Jeb, when spoken to, will remark how familiar the player is.