" The Lawrence Sherman who went to Kansas City is the same Larry Sherman who had worked with David Weisburd in Minneapolis a few years earlier, establishing the Law of Crime Concentration. They were friends. They taught together for a time at Rutgers, where their department chairman was none other than Ronald Clarke, who had done the pioneering work on suicide. Clarke, Weisburd, and Sherman—with their separate interests in English town gas, the crime map of Minneapolis, and guns in Kansas City—were all pursuing the same revolutionary idea of coupling. "

― Malcolm Gladwell , Talking to Strangers: What We Should Know About the People We Don’t Know