He has also tweeted : "About a year ago, I asked Doug to manage both engineering & production. He agreed that Tesla needed eng & prod better aligned, so we don’

He has also tweeted : "About a year ago, I asked Doug to manage both engineering & production. He agreed that Tesla needed eng & prod better aligned, so we don’t design cars that are crazy hard to build. Right now, tho, better to divide & conquer, so I’m back to sleeping at factory. Car biz is hell …" https://twitter.com/elonmusk/status/980913157739765761 https://twitter.com/elonmusk/status/980913157739765761