Google Published a Post on How They Generate Knowledge Panels
https://www.blog.googleIt’s nothing groundbreaking but it gives you a basic overview of Knowledge Panels, Knowledge Graph, they go on to say that Wikipedia is not the only source, how they display it on desktop vs mobile, how you can provide feedback and claim Knowledge Panels, etc. I don’t think there is anything new there but worth a read if you need to get a basic overview of Knowledge Panels.
Fun fact: Here is the Knowledge Panel for Saijo George, that was my one-trick pony when interviewing for SEO gigs?.