Is this because you don't believe that employees have a problem with monocultures? Or because the initiatives they undertake don't address the problem?
Company culture is set by the leadership, if leadership is in the way any effort by the diversity guy is futile. I have never encountered a single one that wasn't a figurehead and several that were a nuisance.
They definitely don't fix the problem. As the sibling comment points out, diversity is a result of tons of factors - office locations, industry sector, compensation packages, pto, work life balance culture; and, most importantly, the diversity of the candidate supply itself (you're delusional if you expect a large deviation from graduation ratios).
It's sort of similar to hiring a "head of profit". Profit, like diversity, is the outcome of the entire company's operations.
