One of the key designers behind some of Apple's most daring Mac products in the past few years has moved to Tesla to work on electric cars. 9to5mac has learned that Matt Casebolt, a high profile Senior Director of Design for Apple’s Mac lineup left the company last month for a role at Tesla as Sr. Director Engineering, Closures & Mechanisms. Casebolt's job change comes a day after Chris Lattner, one of Apple's most visible directors as its head of developer tools and creator of its programming language, Swift, announced that he was headed to Tesla to head software for self-driving cars.