Author Jonathan Eig sets out to write the first unauthorized biography of Muhammad Ali, covering not just the champ's fights but every important aspect of his life. His goal? Simple: To write the Greatest Biography of All Time. That meant interviewing all of the key people in Ali's life, and maybe even talking to the legend himself. It took four years to write, and hundreds of interviews with people like Don King and Larry Holmes, as well as Ali's wives and family members. Tune in as Jonathan Eig tells us about the stories that didn't make it into the book—the story of him Chasing Ali. Learn more about the biography "Ali: A Life": http://bit.ly/EigAli