Now
- Remove him as owner from mediawiki* Ruby gems: https://rubygems.org/profiles/cmcmahon
- Make sure both @dduvall and me are owners of all mediawiki* Ruby gems
- transfer the main Sauce Labs account to me: submitted support request #19650
When he leaves
- Remove access in puppet
- Remove him as owner from QA mailing list: https://lists.wikimedia.org/mailman/admindb/qa
- Remove him from Jenkins e-mail notifications:
- unassign him from all phabricator tickets: https://phabricator.wikimedia.org/maniphest/query/rD08zpzbsrGC/#R
- remove him from owners of #wikimedia-releng