Writer and Jigsaw CEO Jared Cohen talks successorship, about power, and everything he learned from studying Harry Truman, Teddy Roosevelt, and other presidents.

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By day, Jared Cohen uses technology to fight terrorism–he’s the CEO of Jigsaw, previously part of Google and now under Alphabet. Before that he was a Rhodes Scholar at Oxford, where he earned his grasp & #x2019 and served at the State Department;s in global relations. In his spare time, he’s a student of history and political science. His new book, Accidental Presidents: Six Men Who Changed America, examines how unplanned presidential transitions have shaped America.  He talks with Wharton organizational psychologist Adam Grant about what he has heard about power and leadership succession from the men who ascended into the Oval Office with no elected.