Mark Hebner is the founder and President of Index Funds Advisors, Inc., author of the ifa.com and the book, Index Funds: The 12-Step Recovery Program for Active Investors, with a Foreward by Nobel Laureate Harry Markowitz. You can purchase the book from amazon at indexfundsbook.com. He has been nominated as the author of one of the three all-time greatest investment books, along with Warren Buffett and John Bogle. He does a weekly radio program, is a frequent lecturer and has attended over thirty investment conferences and is considered the leading internet provider of information on index funds and especially information on Dimensional Funds Advisors mutual funds and portfolios of the research indexes used by DFA.