Alan Turing was a British computer scientist and logician. He rose to prominence when he cracked ENIGMA, the code used by the Nazis during WWII to direct their armies. Today Turing is best known for his Turing test, which evaluated the limits of computer intelligence. For Carr, Turing is important as a forefather of the modern computer. He created a blueprint for the modern all-capable computing device with his concept of the Turing machine, an imaginary device that could be programmed to do any sort of task. Today, the Turing machine is a real technology: the modern computer.