Tesla's Autopilot uses hardware from both Mobileye and Nvidia to control the Model S on highways. Apparently Tesla would like to discontinue using Mobileye’s system in favor of bringing it in-house, according to an email exchange between Tesla CEO Elon Musk and George Hotz, a software engineer mainly known for being the first person to jailbreak the iPhone.
A report by Bloomberg's Ashlee Vance would have us believe 26-year old hacker George Hotz has built a self-driving car from scratch in a month. Unfortunately for this urban myth, it's fairly obvious the 2016 Acura ILX he's using isn't a random choice.... Honda have offered Adaptive Cruise Control with Lane Assist since 2013.
AcuraWatch Plus is a basic $1300 option available on this car that provides Adaptive Cruise Control, Lane Keeping Assist, Collision Mitigation Braking & Road Departure Mitigation.. So this Honda can do what he's demonstrating off the showroom floor.
A more accurate description of Hotz's work is "reverse engineering".