Fr. Jonah, to my knowledge, was never a member of HOOM, but there was a time when he was something of an innocent dupe for them.
I wish I could say I didn't "know" Bill, but I have met him several times, most times in association with one of that monk Ephraim's cult centers.
Someone want to explain some of this about monks/cults/etc. for those of us who have had our hands full watching problems in Catholic/Anglican/Methodist churches.