Elon Musk hires Charles Kuehmann, who previously work for Apple and QuesTek Innovation. He is alloy experts who study in material science, and he will work as Vice-President of Material Engineering at Tesla and Space X. His new position requires him to deliver innovations in material use in both companies. It is standard practice for Tesla and Space X to move their manpower whenever needed. But in this case, Kuehmann will work at both companies like Elon Musk.