Was tired of referring to a steam discussion post to find this data
https://steamproxy.com/app/1580800/discussions/0/3725072332582911063/

All Credit goes to Draken, who found this information in the in-game file database.

Guilds and Secret societies is required to access teachers.

Teachers will teach you up to their level in a expertise and actions from that expertise.

Aeromancy(12), Llanvale, Day
Aeromancy(3), Thaumar, Day
Affliction(12), Grysbog, Night
Affliction(14), Hirdwood, Night
Affliction(16), Grysbog, Night
Alchemy(1), Lanmerih, Day
Alchemy(12), Xahn, Day
Alchemy(16), Thaumar, Day
Alchemy(3), Barrow's Bay, Night
Alchemy(5), Nidwald's Descent, Day
Angelic Magic(14), Arboris, Day
Angelic Runes(14), Volgstead, Day
Blood Magic(18), Fort Crooklaw, Night
Blood Magic(3), Misthold, Night
Blood Magic(7), Innford, Night
Combat(1), Vanburg, Night
Combat(14), Fort Crooklaw, Day
Combat(18), Barrow's Bay, Day
Combat(7), Nidwald's Descent, Day
Conjuration(7), Xahn, Day
Diplomacy(14), Xahn, Day
Diplomacy(18), Fort Harrow, Day
Diplomacy(3), Fort Crooklaw, Day
Diplomacy(5), The Twin Pillars, Day
Diplomacy(7), Rivermoor, Day
Esotericism(12), Skarfjord, Day
Esotericism(3), Thaumar, Day
Esotericism(5), Rivermoor, Day
Geomancy(14), Celaenor, Day
Hunting(1), Celaenor, Day
Hunting(16), New Ulnathiir, Day
Hunting(16), Tethyar, Day
Hunting(5), Nereis, Day
Hydromancy(12), Celaenor, Day
Hydromancy(16), Jorunfjord, Day
Hydromancy(5), Glenfield, Day
Illusions(7), Nrekveil, Night
Infernal Magic(12), Volgstead, Night
Infernal Magic(16), Lucina, Night
Intimidate(1), Herman's Rest, Day
Intimidate(12), Jorunfjord, Night
Intimidate(18), Fort Crooklaw, Day
Intimidate(7), Pelton, Day
Invention(14), Roverford, Day
Invention(18), Albruk, Day
Invention(3), Arboris, Day
Invention(7), Fort Harrow, Day
Leadership(12), Albruk, Day
Leadership(16), Roverford, Day
Leadership(3), Mournvale, Day
Leadership(7), New Ulnathiir, Day
Marksmanship(18), Llanvale, Day
Marksmanship(3), Mirai, Day
Nature Magic(1), Hirdwood, Day
Nature Magic(14), Rivermoor, Day
Nature Magic(7), Oakstead, Day
Necromancy(1), Herman's Rest, Night
Necromancy(18), Glenfield, Night
Necromancy(5), Innford, Night
Necromancy(7), Geirsver, Night
Nobility(12), Glenfield, Day
Nobility(14), Skarfjord, Night
Nobility(16), Crowhaven, Day
Nobility(3), Black Market, Day
Nobility(5), Lucina, Night
Perform(14), Grysbog, Night
Perform(3), Celaenor, Night
Perform(7), Misthold, Night
Pyromancy(1), Jarakkal Oasis, Day
Pyromancy(7), The Twin Pillars, Day
Religion(1), Lucina, Day
Religion(18), The Twin Pillars, Day
Religion(5), Jorunfjord, Day
Research(18), Fort Harrow, Day
Rituals(12), Nidwald's Descent, Night
Rituals(14), Crowhaven, Night
Rituals(16), Crowhaven, Night
Rituals(3), Mournvale, Night
Seduction(12), Black Market, Day
Seduction(16), Albruk, Night
Seduction(18), Albruk, Day
Seduction(3), Seagull's Rest, Day
Seduction(5), Barrow's Bay, Day
Seduction(7), Geirsver, Day
Shadow Magic(18), Lanmerih, Night
Shadow Magic(3), Barrow's Bay, Night
Shadow Magic(5), Innford, Night
Stealth(14), Jarakkal Oasis, Night
Stealth(18), Black Market, Night
Stealth(7), Roverford, Night
Subterfuge(1), Misthold, Night
Subterfuge(1), Oakstead, Day
Subterfuge(5), Lucina, Night
Survival(1), Lanmerih, Day
Survival(12), New Ulnathiir, Day
Telepathy(14), Fort Harrow, Day
Telepathy(7), Arboris, Day
Thievery(1), Innford, Night
Thievery(16), Crowhaven, Night
Thievery(16), Vanburg, Day
Trade(16), Albruk, Day
Trade(5), Roverford, Day
Witchcraft(1), Lanmerih, Night
Witchcraft(12), Vanburg, Night
Witchcraft(18), Llanvale, Night
Witchcraft(5), Oakstead, Night