I've been a fan of his since the '90s. I once had the opportunity while visiting a relative in Boston to ask Sheldon in person at the shop where he worked (Harris Cyclery) if he could help me find a rather obscure part for my old Raleigh. I really had no expectation they would have it, I just wanted to see the shop and maybe encounter him. Sure enough, they had it, and my encounter with The Oracle only cost me about $5.
Was a sad day when he passed.