Elon Musk is bringing new meaning to the term “hands-on management” in his overhaul of Twitter.

In the weeks since he took control of the social media company, a period in which over two-thirds of its employees have departed through either resignations or firings, Musk has immersed himself in the projects he is most interested in. He has spent hours with the team in charge of a subscription version of the service, known as Twitter Blue, ahead of an impending relaunch of that product. He has taken to Twitter to hold long, discursive conversations about Twitter’s 2020 handling of the Hunter Biden laptop scandal and to personally implore users to tweet more.

Musk has brought in lieutenants from his other companies to take charge of some key departments, such as finance and legal, while elevating some staffers to run ad sales and trust and safety, the group that handles content moderation and issues such as spam and harassment on the platform. Some departments, such as human resources, appear to have no formal leader. With the exodus of so many executives since Musk got the keys to Twitter in late October, over 100 top people at the company now either report directly to Musk or don’t currently have another boss formally separating them from Twitter’s new owner, by the estimate of one former executive.