John C. Bogle
John Clifton "Jack" Bogle (May 8, 1929 – January 16, 2019) was an American investor, business magnate and philanthropist who was the founder of The Vanguard Group and is credited with popularizing the index fund. An avid investor and money manager himself, he preached investment over speculation, long-term patience over short-term action, and reducing broker fees as much as possible.