If you’ve been out and about in Silicon Valley in the last month or so, chances are you’ve heard of “Alpha Girls,” a new book written by longtime journalist Julian Guthrie about four investors who’ve made a big impact on the world of startup investing. The book recognizes them — Theresia Gouw, MJ Elmore, Sonja Hoel Perkins, and Magdalena Yesil — because they are interesting individuals, each with very different upbringings and skill sets and areas of expertise. But they also succeeded in the venture industry during a time when they were almost always the only woman in the room, or at the conference, or in the middle of a team-building event.