After stints at Twitter and Foursquare, designer-marketer Tristan Walker was invited by revered tech investor Ben Horowitz to become an Andreessen Horowitz entrepreneur in residence. While there, Walker cooked up the idea for a health and beauty brand for people of color, filling a long-decried gap in the market. The first brand under his Walker & Co. is Bevel, a shaving line with sleek, vintage-inspired products that combat razor burn, a particular problem for black men. It is sold by subscription only, and signups are growing by an average 50% a month. Many see Walker as a key player in efforts to address Silicon Valley’s lack of diversity. To that end, he also co-founded Code2040, which places minority engineers in summer internships at top tech companies, named for the year when the majority of the country is projected to be nonwhite.