In the pantheon of modern Jewish leaders, Chaim Weizmann is a giant. One of the founding fathers of the State of Israel and its first president, he was also a president of the World Zionist Organization, and an eminent chemist, for whom Israel’s renowned Weizmann Institute of Science was named. Yet, until now, there has never been an authoritative biography of Weizmann that removed the layers of myth obscuring our image of the man. Both a personal portrait of a fascinating man and a far-reaching history of the Jews in the modern world, this book, written by one of America’s leading authorities on Jewish history, delves into the factors that shaped Weizmann’s personality and worldview. Though the book focuses on the making of Weizmann as a Zionist leader, it also lays the foundations for understanding his extraordinary achievements as a scientist. This volume, the first of two that will cover his entire career, ends when, at the age of 40, Weizmann is thrust onto the center stage of world politics as a major negotiator for the Balfour Declaration.