American Zen Teachers Association
It is a peer-group organization of ordained and lay Zen Buddhist teachers, all of whom have received either teaching authorization or dharma transmission from the mostly Asian Zen teachers who brought their practices to America in the second half of the twentieth century, or their heirs.
Today the AZTA has grown to over one hundred members, fifty or sixty of whom regularly attend its annual meetings. AZTA members serve Buddhist groups ranging from a dozen or so people who meet and practice in members’ homes or area churches to those serving three or four hundred members and who meet and practice in large temples and monasteries.
The AZTA does not claim to be a "credentialing body," although as it counts so many generally recognized Zen teachers in the West, being listed on its website amounts to a kind of endorsement. Nonetheless, the AZTA officially states "There are qualified Zen Teachers that are not AZTA members."