This book tells the life story of Abu Nasr Muhammad al-Farabi, the father of Islamic philosophy, who was called “the Second Teacher” after Aristotle, the First Teacher. He lived in the tenth century CE, traveled through the cities of his age, left to the world the greatest book on music and the first encyclopedia of the sciences, reconciled Greek philosophy with religion, and called for a happy life in a virtuous city, as expressed in one of his most famous works, Opinions of the People of the Virtuous City. The “Scientists of Islamic Civilization” series presents the biographies of outstanding Arab and Muslim scholars and their contributions to human civilization.