Adding Sheldon McKay
Adding John Corless
Adding Aaron Garoutte
Adding Arliss Collins
Blg post about job in TGAC
Updating Arliss Collins' bio
Merge branch 'tgacJob' of github.com:apawlik/site into apawlik-tgac-post
Merge branch 'master' of github.com:swcarpentry/site into apawlik-tgac-post
Job opening at TGAC