Moishe Campbell was a hunter active around the 1930s.
Moishe Campbell resided in New York in the early 20th century. He chronicled H.P. Lovecraft's attempts at creating a portal to other dimensions in his journal. While on the search for a way to open a door to Purgatory, Castiel stole the journal which was at Bobby's place. Luckily, Bobby had made a copy of the journal for safe-keeping.