Robert Mnookin has spent his career exploring exactly this conundrum: the ways interpersonal, and geopolitical, disagreements unfold — and how to handle really difficult disagreements mindfully and rationally rather than emotionally and thoughtlessly. He is the Samuel Williston Professor of Law, Emeritus at Harvard Law School – and he is the author and/or editor of at 10 books, including “Bargaining with the Devil: When to Negotiate, When to Fight” which was published in 2010. It offers practical advice on addressing tough conflicts analytically through examples that range from siblings fighting over an inheritance, to Winston Churchill’s decision to refuse to negotiate with Adolph Hitler.