I did a huge amount of interviewing, but after about 2002 was not in charge of hiring decisions, which was when I stopped working for tiny, failing startups.

In these tiny startups, most hiring was word-of-mouth. Up until I left the United States, I hadn't looked for a job in twenty years - people called me up. Of course, if you have no Black people you've worked with before, they won't be part of your old boys' network.

Same goes for women. However, I have worked with women and even had a strong female boss (one of the better managers I had except that she like all Google management worked herself to exhaustion all the time and didn't have enough time to actually deal with her 80+(!) direct reports.) On the other, other hand, ~20% of America is Black but 50% women.

To be honest, I interviewed almost no Black candidates at any time and very few women. Many times I was the one selecting the resumés and I wasn't just color- or sex-blind - I definitely put my finger on the scale for anyone I guessed was female or a person of color from their resumé, if only out of boredom with endless Aspie white guys.

Google at least was pro-active. When I left, they had decided that getting interns in University was already excluding people who never even got there, so the last year I was there, my team had two high school girls as interns, one a person of color.