ValueWalk is offering a free report on Warren Buffett. It's actually a 10-part report. You can get it by giving them your email address and they'll send you a link to this page.
The page links to reports on other great investors as well.
Warren Buffett (the early years)
Charlie Munger
Walter Schloss
Seth Klarman
Ray Dalio
The Great Little eBook on Value Investing