Maybe not a _cornerstone_ per se, but Jeff's active in a number arenas (Ansible, Docker, general programming, ...) and has gained a level of name recognition. I

Maybe not a _cornerstone_ per se, but Jeff's active in a number arenas (Ansible, Docker, general programming, ...) and has gained a level of name recognition. I think he's taking a reasonable stand here and contributing whatever weight his reputation carries to the discussion.