I wondered about Sam Walton. He is actually Sam Walton Jr, who, along with his siblings, inherited Wal-Mart and Costco. He's the grandson of the founder. He moved to Flagstaff around 1999-2000 and started donating to local nonprofits. See my old article, Cash Cows Don't Graze: The Peculiar Relationship of Grand Canyon Trust and Wal-Mart at
http://www.vlrc.org/articles/171.html.
In day-to-day dealings, he goes by another first name and uses Sam for legal type stuff. Does he live up there now, too?
In a quick Google search, I see that he's on the board (or was on the board) of the Environmental Defense Fund (the nation's largest legal group for environmentalists).
More later . . . have got some work to do.