Going undercover to meet slaves and slaveholders for his book Disposable People: New Slavery in the Global Economy, Kevin Bales exposed how modern slavery penetrates the global economy and flows into the things we buy. Disposable People was named by the Association of British Universities as one of “100 World-Changing Discoveries” and published in ten languages. He co-founded the NGO Free the Slaves, which has liberated thousands of slaves worldwide. Bales is the Professor of Contemporary Slavery at the University of Nottingham and Lead Author of the Global Slavery Index. The film based on his work, Slavery: A Global Investigation, won a Peabody and two Emmys. Check out his TED Talk.