Bio is probably empty because for a certain age of HN readers, he's already well known and regarded, but over time as the HN population grows it's obviously less likely to be the case.
I read it in my early teens.
Now, at 75, I'm astonished at how much has changed online. When I first started fooling with the Arpanet in the early 1980's, I calculated that I probably knew around 0.01 percent of everyone on the net. (where "knew" meant something like "have heard of" or "saw at a meeting") ... that number impressed me with how big the network was.
Today, what percent of the network users does a person know? 1 / 10^-7 or so?