The Bogle Effect, written by Eric Balchunas, is a biography and analysis of the impact of Vanguard founder, John Bogle on the financial industry. The book explores Bogle's influence on the rise of index funds and how his ideas have shaped the investment world, including areas such as active management, ETFs, the advisory world, quantitative investing, ESG, behavioral finance, and trading platforms. The book also delves into Bogle's unique leadership style and his philosophy on investing. The Bogle Effect is based on hours of exclusive interviews with Bogle and dozens of other individuals who knew him, worked with him, and were influenced by him. The book aims to give readers a deeper understanding of Bogle and his impact on the financial industry, and how his ideas continue to shape the way we invest today.