The guy is a visionary to say the least. He has made nvidia the top contender in pretty much every market its in and by a huge margin in most cases. Gaming, HPC, multimedia, robotics, automotive, just to name a few, and of course the cherry on top AI.
CEOs CAN make a huge difference, just take a look at AMD's Lisa Su, she brought the company from almost bankruptcy to a real competitor with intel. She does lack Jensen's vision though IMO, AMD doesn't even figure in most markets nvidia is in, it has a lot of catching up to do.
BTW he did hire the person that hired the person that hired the person that hired the person that hired the person that hired the person that hired the engineers
I recall an ex-nvidia exec that said that the best thing nvidia got from the 3dfx buyout was not the technology, but the engineers.