I know he has a place in the early history of Scheme, but even then he was rejecting it, I think. But if you look at his website, <https://professorhewitt.blogspot.com/> , or his recent papers it just seems like you are looking at the work of someone who is unable to find, or unwilling to work with, an editor.
Which makes it hard to make heads or tails of his recent work, especially when he is throwing around phrases like disproving Godelian Incompletness or Actors being black boxes that behave in ways analogous to Heisenberg's Uncertainty Principle and in the meantime attaching himself to Erlang.
Is this just normal behaviour for emeriti?