About 10 years ago he started a project with Ruby running on Graal before it was known as TruffleRuby. I still remember those HN submissions. SubstrateVM, Graal, The VM to rule it all. And as far as I am aware, he was the only one putting all papers about Ruby and Compilers Design in a single place [1].
I still remember a thread which I have bookmarked somewhere, where you have the lead of JVM, Graal, TruffleRuby, JSC, V8 and Spidermonkey along with another compiler expert arguing ( or in a heated debate ) about Dynamic languages. And when ever you have compiler related submission on HN, you will see him contribute his expertise on the subject.
He has been a valuable member of the Ruby and HN Community. I once joked "I am a simple man, I see Chris Seaton, I Upvote :)." I still remember I felt honoured when he followed me on Twitter.
He will surely be missed by many.
R.I.P