A couple of his boxes are posted adjacent to No. 12 at Creeksbend Golf Course, where we encountered the kindly gentleman with a long walking stick today. Greg, a birder himself, quickly engaged Ben on his favorite topic, interrupting his round.
He puts out the houses in pairs... one for the bluebirds and one for the tree sparrows. We don't know why the sparrow accommodations. Maybe next time we see him we'll ask.