I wanted to know more and did a bit of research. What I found out (by just looking around on the internet), was that this man went on to work for a while at another private secondary school. And today, he still works as a teacher, at a public secondary school - still with teenage girls.
It took me a bit to come to a decision - I know that most of his former students would hate me for making this public, and he's now at the end of his work life anyway - but in the end, I contacted some journalists. One was willing to research that story, and I provided them with links and a list of people who they could talk to.
And then - nothing happened, because whoever the journalist approached would just say that the guy was a super great teacher.
The end.