Although the book is almost 15 years old and a lot has change in the economic world in that time, The Millionaire Next door is a must read book. It doesn't name real names, but based on interviews and surveys with real millionaires the book compiles profiles backed with lot of data of your average millionaire.
Before reading this book my impression of millionaires where something complied from TV and movies of extreme luxury, and extreme spending. This book tells a different story, a story of hard work, and frugality. In one chapter they discuss what makes the perfect Millionaire, or what Business produce the most. One of my favorite lines from the book "...the character of the business owner is more important in predicting this level of wealth than classification of his business." If you haven't already you should read this book.