JOHN C. “JACK” BOGLE, 84, has influenced your life 
in a major way – assuming you’ve ever invested in a mutual fund. Back in 1975, Bogle created this radical tool called an “index fund”, an intentionally boring mutual fund that mirrors the performance of a broad-market index. He championed low-cost, long-term investing and founded the US’s only client-owned mutual-fund company, Vanguard, which manages a cool $2.1-trillion (but doesn’t take a profit). Bogle has written 10 books that are essential reading for anyone investing today. Start with 2008’s Enough (R249, Kalahari). Want to retire with a pile of cash? Then read on.