Gelernter was, and still is, one of the top computer science professors in the country, and typifies the scientific-technological academic community which was the target of Kaczynski's ire.
I remember Kaczynski's Manifesto (or Mein Kampf or whatever he called it) which was in the NTY and WaPo some 25 years ago.
Kaczynski is still breathing air. I wonder if he's still writing? He's a genius-level math guy himself, but it seems some of his uniquely painful life experiences --- including being brutalized for 200 hours in a psychological experiment while at Harvard --- really messed with this mind.