For example, people with "non-white sounding" names don't get hired at the same rate as those with "white sounding" names when they have the same skillset. http://www.nber.org/digest/sep03/w9873.html
I think these biases operate at a low level, below most of our understanding. I like that GH is having this conversation in the open and working to rid themselves of these biases as much as possible.
To me, this is all relevant socioeconomic data. Why not look at the distribution of gender, race, sexuality, religion, etc, in your workplace? If there's a discrepancy, why not figure out what the root cause is? Given the starting point of "all these groups of people have the same capacity for talent and skill", why is the distribution skewed? What does it hurt to ask?