Short answers, pulled from the story.
Princeton University Press released the joint book Theory of Games and Economic Behavior in 1944. The authors approached the problem from different angles yet found common ground in strategic interaction.
Oskar Morgenstern provided the necessary expertise for the full economic application of John von Neumann's work. Their partnership transformed abstract mathematical ideas into a practical framework for understanding human decision-making.
The appendix to the Second Edition derived expected utility from its axioms and was published in 1947. This section provides an Axiomatic Treatment of Utility at the end of the text.
Richard Stone wrote in 1948 that economists should view this book as the most important contribution since J.M. Keynes's General Theory appeared in 1936. He noted it addressed problems found in value theory under conditions like duopoly and imperfect competition.
Jimmie Savage completed the development of subjective probability theory in 1954. Von Neumann and Morgenstern used objective probabilities assuming all agents shared the same probability distribution but left subjective theories to future researchers.