For a quick overview, google Microsoft stock and take a look at what happened to it after he became CEO in February 2014. It had been farting along at $24-35 a share with little lasting change since 2000. As soon as he got involved it started rising stratospherically and is now at about $360.
Partnering with openAI turned out to be a brilliant idea that has helped them corner a brand new market. And poaching perhaps half their staff after an unforced error by their board is even shrewder.