John Bogle founded the Vanguard Group and before his death served as a vocal proponent of index investing.
Stay the Course: The Story of Vanguard and the Index Revolution by John C. Bogle
John Bogle dies at 89; fought for lower fees for investors
Jack Bogle, who founded Vanguard and invented the index fund, dies at age 89 – Chicago Tribune
Bogle Sounds a Warning on Index Funds - WSJ
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