I have the rabbi's name and the name of his yeshiva, but still need to confirm both. The yeshiva may not actually be functioning from what I've been told, and could instead be a tax dodge.
The rabbi, "Y.M." or "J.M.," is the son of a prominent and wealthy Satmar hasid. I believe he was raised in Kiryas Joel but moved to Williamsburg as an adult. He is now 33-years-old, I'm told.
The rabbi works in kiruv, haredi missionary outreach to non-Orthodox or marginally Orthodox Jews, I'm also told, and he met the boy through attempting to missionize him.
I'll post more information when I have it.