Mitchell–Hedges was known for his connection to the Mitchell-Hedges crystal skull, claimed to have been found with his adopted daughter Anna Mitchell–Hedges in Lubaantun, Belize in 1924.
Mitchell–Hedges ishte më i njohur për zbulimin e kafkës së kristaltë Mitchell-Hedges të cilën ai e gjeti me vajzën e tij të adoptuar Anna Mitchell–Hedges në Lubaantun, Belize.