Yes, he had lots of great and original ideas, and made them work. His Github account is full of knowledge.
Indeed. I believe a site like ClarionHub, that Brahn started and moderated for years, is key to the long-term viability of Clarion as a supported development ecosystem.
Also, very admirable that still a few weeks ago, he was trying to help the Clarion community. His last post here: Clarion Developer Needed - Upwork
He will be missed.