Elon Musk Gives Advice To Jack Dorsey On Running Two Companies, And It's Not What You Expect With Jack Dorsey being appointed the CEO of Twitter, he joins the ranks of Elon Musk as he gears up to juggle two CEO roles. An experienced hand at multi-tasking, Tesla and SpaceX CEO Musk has doled out some valuable advice for Dorsey. by Anu Passary