Beginning in 2013, a handful of tech companies (including Yelp, where some of us work, Google, LinkedIn, and Facebook) began to research and release data on the diversity of their workforces. The numbers were grim. For instance, in 2014 only 10% of Yelp’s engineers were female. Seven percent of Yelp employees were Hispanic, and 4% were black. These figures were similar at other tech companies, most of which had fewer than 20% of their technical positions filled by women and had low representation of black and Hispanic employees. At Yelp and elsewhere, seeing these numbers was a wake-up call.