Even though I never got the chance to talk to him personally, he has inspired me deeply. I learned a lot through his tweets and blogs. If it wasn't for him, maybe I still would have considered LSI keywords as a legit thing in SEO.
He introduced all these terms like Entities, Knowledge Graph, Semantic SEO, TF-IDF, etc. to me, and has really changed the way I look at SEO. Bill had always been there to stop myths from spreading and helping newbies like me think from a different perspective rather than what we get from other courses and blog posts.
Rest in peace, Bill ♥️! You have helped thousands of SEOs to move forward in their career and your contribution will never be forgotten.