This book provides a history of risk management from ancient times to the modern day. It summarizes the contributions of many mathematicians, philosophers, and others who helped develop our understanding of probability and risk calculation over the centuries. The author traces the evolution of key concepts from the beginnings of probability theory to modern portfolio management and decision making under uncertainty. Major figures discussed include Pascal, Bernoulli, Bayes, and 20th century economists who advanced risk analysis and its applications. The book is divided into five sections corresponding to different historical periods in the development of the field.