I'm using this thread as a one-stop-shopping list of ACTIVE guilds that are dedicated to specific professions. Their members help by teaching other players, how to use the prof to its fullest (or to counter it), theorycrafting builds, and discuss changes or suggestions. I'll update the list based on responses below, including the best contact method(s).
* Contacts: Zacchary.6183 (NA) , saerni.2584 (NA), Wargameur.6950 (EU)
* Recruitment Thread: https://en-forum.guildwars2.com/discussion/671/teef-thiefs-forum-guild
* Contacts: --pending permission--
* Recruitment Thread: --pending permission--
A good player can succeed with whatever is meta. A great player can succeed with whatever they want.
[Vial of Salt]
Thief's Forum Guild [Teef] is a guild with expansive knowledge of the Thief profession, willing to teach anyone willing to learn. Details in link.