In 1915, polar explorer Ernest Shackleton’s ship became trapped in ice, north of Antarctica. For the next two years, he kept his crew of 27 men alive on a drifting ice cap, then led them in their escape. How Shackleton did that has become one of the most famous leadership case studies. In the first episode of a four-part special series on leadership, HBR Editor in Chief Adi Ignatius and Harvard Business School professor and historian Nancy Koehn analyze Shackleton’s leadership during the struggle to survive. They discover lessons in building a team, learning from bad bosses, and cultivating empathy.