Ellen J. Kullman, the retired Chairman and CEO of DuPont, describes how she guided the storied science and technology company through a contentious proxy battle with activist investor Trian Partners, which acquired DuPont shares in 2013 and sought to break up the company. Trian’s pursuit of board seats led to a 2015 shareholder vote, which DuPont won under Kullman’s leadership. In a sweeping interview with Professor Lynn S. Paine, Kullman describes lessons from her experiences navigating the proxy contest that captured national attention as well as about working with your board, setting company strategy, leading a large corporation, evaluating time frames for shareholder returns, measuring stakeholder performance, assessing shareholder engagement, considering joining a new board and boardroom dynamics, and understanding how boards have changed over the years.