It's such an honor and privilege to know Bill Slawski, a true SEO legend. I have been reading his blog since 2010 when i started my SEO career. Even though i have never had a chance to meet him personally, i always admired and followed each and every post that he does. I always keep his blog in my arsenal if i wanted to read anything about Deep technical SEO and Google Patents. I would say that some part of my SEO career has been influenced by his writings and has helped to further my skills.
Its another great loss to the SEO industry and may his soul RIP.