Detective Josiah Thompson. Thompson was a tenured professor of philosophy at Haverford College when he applied for a job at a San Francisco detective agency. He has since left academia and works full-time as a private eye. He's written an account of his work titled Gumshoe: Reflections in a Private Eye. Thompson's cases run the gamut from recovering money from an attic in a drug case to saving an innocent man from the gas chamber.