https://phys.org/news/2018-10-tesla-chair-rein-ceo-musk.html

Musk is giving up the chairman's role under a settlement announced Saturday with the Securities and Exchange Commission. Besides a new chairman, Tesla was also ordered to appoint two new, independent members to its board. A more assertive board could provide the kind of tighter oversight that many legal experts, and Tesla investors, say is overdue for a company of Tesla's market value.

The settlement stemmed from a lawsuit the SEC filed charging Musk with misleading investors in August with a tweet that said he had "funding secured" for taking the company private.