If I were to choose authors whose work relates to each of the book in the series, I would name Ayn Rand and Aristotle for the first book. Not only did each provide groundwork for philosophy, but also Ayn Rand explained the real concept of the hero and leader. Concerning the second book, which is science and theory of the mind, I will point to Carl Sagan, Richard Dawkins, William H. Calvin, David Bohm, and Lawrence Krauss as major influences. The third book, focusing on values and drugs, is greatly based on Ayn Rand (theory of values) as well as own views and current scientific results. I drew a lot from Karen Armstrong‘s books for the fourth book about religion and theology, and the chapter about psychology is greatly influenced by the ideas of Carl Jung, Peter S. Beagle, Joseph Campbell, and Robert Cialdini. While Ayn Rand again provided basic philosophical ideas, modern science and personality theory help us to connect with who we are and what our values actually are. Finally, for the book on art and heroism, I will draw heavily on Ayn Rand, general music theory and a number of authors of motivation books.