He would probably know Gus, because they're around the same age (I think Gus is a year older) and both were in Hufflepuff. If you want any established things from Hogwarts?
Delilah Warbeck is also at St. Mungo's as a P&PP healer, so yay for coworkers.
Delilah Warbeck is also at St. Mungo's as a P&PP healer, so yay for coworkers.