There is a staff list/information kiosk located in Emeralds Saloon. If you head up the stairs, and go through the first door you will be taken to a room that branches into four others. These branches are Administrator Lore(Staff List), Basics(Information Kiosk), Ol' West History, and Top Ranking(a room for future high stat holders).

Edit:
The Administrator Lore room doesn't list every admin there is. Just a few select are there, and are given a back story(hence the name).