Norvig and Graham both wrote books full of code, with either the book or the code freely available, and AFAIK their books first made their reputations. I'm sure

Norvig and Graham both wrote books full of code, with either the book or the code freely available, and AFAIK their books first made their reputations. I'm sure your point is correct that open-source people are overrepresented, those just aren't optimal counterexamples.