On my AT hike I met both Warren Doyle and Baltimore Jack. I met both The Onion and Mr Magoo on their historic CDT yo-yos in '07. I ran into Sly in Glacier Park that same trip.
Anybody famous for not hiking? Let's see--I did open a ranch gate for Bruce Babbitt (former AZ gov and Sec'y of the Interior under Clinton, (back when I was alive)), when I was hiking across his ranch on the AZT. I said it was an honor meeting him and he told me what cattle tanks had water in them. He had a truck load of salt licks. (Later, at Lockwood Tank, I had to push through a herd of his thirsty bulls to get to water, one of the more nervous maneuvers I've ever done while hiking.)