The "Leader's Companion: Insights on Leadership Through the Ages" by J. Thomas Wren is a trade paperback book published in 1995 by Free Press. This book offers insights on leadership through essays and illustrations, making it a valuable resource for those interested in business, economics, and social science. With 376 pages, this book provides a comprehensive look at leadership and management, making it a companion for leaders looking to gain perspective and insights from throughout history.