On the music side, you should mention his firing Doc as manager and taking over the business of the band.

On the humanitarian side, you should mention his position on the White House council for Community Solutions (or something like that. Google it.)

There's also the arena football team where he was a leader even though he got out of it.

There's really quite a lot that could be said about Jon as a leader. And you're lucky to have the internet at your disposal. I'm so old that I didn't have the internet to help me write research papers/projects. LOL