It's Cliff Stoll, not just some wacky guy. He is extremely famous among people who were interested in computer security in the 90s. I know that's not the sense of "hacker" that "hacker news" refers to, but still.
Yes. He wrote The Cuckoo's Egg for one. My uncle gave me the book when I was a kid. The first Java program I wrote was a sequence generator for the Morris Number Sequence [2] given to Stoll by Robert Morris Sr at the NSA: "What is the next number in the sequence 1, 11, 21, 1211, 111221?"