Harvard Business Review published its first issue 100 years ago with a mission to help leaders put the best management thinking into practice. To mark our centennial, we asked eight current and former CEOs from some of the world's top companies to describe the ideas that have propelled their own careers and organizations. Stephane Bancel, the CEO of Moderna, on planning from the future back; Anish Shah, CEO of Mahindra, on purpose-driven strategy; Roz Brewer, CEO of Walgreens Boots Alliance, on listening as a leader; Nicolas Hieronimus, CEO of L'Oreal, on global vision with local execution; Joey Wat, CEO of Yum China, on continuous innovation; Mo Ibrahim, former CEO of Celtel, on inclusive capitalism; Ignacio Galan, CEO and chairman of Iberdrola, on transparent sustainability reporting; Indra Nooyi, former CEO of PepsiCo, on performance with purpose. As we at HBR look to the future, we recommit to our mission of helping leaders build a better world for customers, employees, partners, and communities.

In 2001 Iberdrola, which had resulted from a merger between two Spanish utilities nearly 10 years before, held assets that were primarily sustainable but included some power­generation plants fired by oil and coal. Its footprint was limited to Spain and a bit of Latin America. Looking for a CEO who was willing to challenge traditional industry models and build a better future, the company tapped Galan. His values gave him the grounding to design and lead Iberdrola's green mission, and he describes the past two decades as some of the most rewarding of his career. He and his team focused an ambitious strategy on their core business of generating and distributing sustainable and renewable energy through plants, networks, and storage facilities, doubling down on a low-carbon future. Competitors thought they were crazy, and regulators raised a skeptical brow. Some senior executives retired or left. But since then Iberdrola has expanded into dozens of countries on four continents, grown to serve 100 million people with power, created one of the largest wind energy companies in the world, and closed all its oil and coal plants. Its net profit of 3.4 billion euros in 2019 represents a fivefold increase since 2001.