CalTech didn't make it, so I guess Knuth would be out of the running ;-)

Knuth taught at Stanford. He still lectures there occasionally:

http://cs.stanford.edu/~uno/news.html#lectures

Case Western Reserve University as well (he did his undergrad here).

FWIW, someone else in this comment thread said they had interviews at top companies without going to a top school.

So don't necessarily count yourself out immediately. Take what I said with a grain of salt.

However, since they do have lists like that (they being unicorn-type companies, I think) they quite likely do use it as a metric- maybe not necessarily a requirement.