Jabez Wilson is the person who initially comes to Sherlock Holmes as a client in "The Red-Headed League" by Sir Arthur Conan Doyle. He himself has red hair. His assistant, Vincent Spaulding, alerted him to an advertisement in a newspaper for a position working for the Red-Headed League that appeared to offer a fairly substantial salary for a minimal amount of work. Wilson applied for and obtained the position.
The job was a very odd part-time one. It required his showing up to an office from 10:00 a.m. until 2:00 p.m. every day, before the start of his work in his pawn shop, which was his main business. When he was in the office, he was required to copy out pages from the Encyclopaedia Britannica by hand. He does this for several weeks progressing almost halfway through the "As", and then arrives at the office one day to discover that the League no longer exists. Puzzled by this turn of events, he talks to Holmes.