There was a time when business leaders and managers didn't worry so much about psychology or other social science research. Malcolm Gladwell's writing played a big role in changing that. His popular exploration of tipping points — the phenomenon where small, incremental actions can suddenly fuse into a full-blown social behavior — brought research insights to life and made them mainstream. Now he's revisiting tipping points, this time looking at how they can be used for damaging results. In this episode, HBR editor in chief Adi Ignatius speaks to Gladwell about how the author’s ideas have changed, the importance of social science and journalism in today's world of virality, and the unexpected ways leaders should consider human behavior. Gladwell is the author of the new book Revenge of the Tipping Point: Overstories, Superspreaders, and the Rise of Social Engineering.