The Moat philosophy of investing was started by investing great Benjamin Graham and was subsequently passed to Graham’s student, Warren Buffett. The philosophy has since been adopted by numerous other investors and book authors who have come up with their own stock picking methods to indentify stocks that will allow investors to follow the Big Moat Stocks philosophy.
Recommended readings to become familiar with the Big Moat philosohphy are Graham’s The Intelligent Investor Rev Ed. (Collins Business Essentials)
and any writing’s by Warren Buffet which are available in the Berkshire Hathaway annual reports.