You're quite right, I had it in my mind they were published contemporaneously, for some reason.

Sartre, Camus and Foucault 's ideas were profoundly influenced by Nietzsche... Marx almost certainly not, though you can't discount the possibility of a reaction against Nietzsche's ideas. Just in terms of pure destructive influence, Nietzsche and Marx have almost certainly had the most impact on the events of the last century, though they can't carry the blame for the abuses and misinterpretations of their followers.

Pynchon's apparently only a recluse inasmuch as he has chosen not to engage with the media, to an extreme degree, but in other respects lives apparently lives a normal life. I'm sure we will learn of his death, if not immediately then relatively soon after.