B Lab, a nonprofit organization launched in July, certifies and promotes B Corporations (B for “beneficial”) - companies that meet exacting standards for environmental and social performance. In seven months the program has ballooned to include over 80 certified U.S. companies representing $650 million in revenues. In this SLM interview, B Lab co-founder Jay Coen Gilbert explains what’s in it for companies, employees, communities, and the environment. (And a recent study suggests that shareholders will benefit, too.)