Has Lupin taught before?

[sbursztynski]

No: HPFGUIDX 87344

Not sure if this has been discussed before, apologies if it has, 
but...Recently, I re-read POA and in the first scene where Lupin 
appears, on the train, it describes his case as having "Professor 
Lupin" on it in "peeling" letters. That suggests it's been there for
a while and as "Professor" seems to be the honorific for a teacher,
we 
have to assume he's done it before, some time ago - but when and 
where? Probably not Hogwarts, or someone would have mentioned it.
This makes it interesting to speculate what other wizarding schools 
might exist in Britain, unless he's been overseas - perhaps thrown
out 
of whatever school it was for being a werewolf? Poor man.

Anyone got any ideas?

Sue