My highschool latin teacher - a highly idiosyncratic individual, not to put too fine a point on it - constructed not one, but two completely artificial language

My highschool latin teacher - a highly idiosyncratic individual, not to put too fine a point on it - constructed not one, but two completely artificial languages, although to be fair, one was a derivative of the other, sort of the way many modern tongues are of latin. The thing is, these were thorougly developed and well thought out constructs - the 'classical' one of them in particular being logically structured and built up from fundamental particles. Felt very much like real languages from what I saw of them. And as probably his only pupil ever to express an interest, believe me, I saw quite a lot. I can still picture him coming to a halt somewhere on the main street, scribbling in his ever present notebook if some new idea had presented itself. And I knew a fresh presentation would be coming up... Idiosyncratic to begin with, and sliding into decidedly bunkers. He was pensioned off early from his teaching position, and later disappeared on a mountain trek. His languages went with him.