My maples haven't turned yet, and he's about a half hour south of me, so a bit ahead of me but not by much. I'll see him at a family event tomorrow and arrange for a time to go snap fall pics. Not sure how long he's been collecting, several years. His trees are regularly featured in our local Flower & Garden Show held in Seattle, as he has a lot of very mature (high caliper) trees. In addition to those in his own yard, he also keeps many at his parents' place, which is more formally landscaped. I'll take some photos of their place tomorrow.
