I was friends with Kevin and talked to him often over email. He was a tireless advocate of addressing the gender gap on Wikipedia and making the projects less toxic. Besides his significant volunteer work on-wiki, he was also a moderator of the gendergap mailing list (a difficult and thankless job). He was always an advocate for those whose voices were not being heard or those who were afraid to speak up due to fear of being attacked. He ran for English Wikipedia ArbCom last year, and addressed some of these issues in his candidate statement: "Our encyclopedia aims to encompass the sum of all human knowledge - a lofty goal that we cannot possibly accomplish unless we take steps to ensure that, to borrow from a recent public comment, we’re sending no demographic into a cultural buzzsaw."
Kevin was one of the countless unsung heroes of our movement, and his passing is a tragic loss. I hope we can pay tribute to his memory by continuing to work towards addressing the gender gap and eliminating harassment on our projects.