This document summarizes the book "One Piece of Paper" by Mike Figliuolo. The book provides a method for leaders to define their entire leadership philosophy in a simple yet profound way using just one piece of paper. Leaders articulate their philosophy through creating short statements called "maxims" that address four aspects of leadership: leading yourself, leading thinking, leading people, and leading a balanced life. Once created, these maxims can help leaders improve by living and sharing their personal philosophy.