Mary Buffett is a highly popular and entertaining public speaker about financial investment strategies, and has appeared before a number of financial organizations, including Barclays Bank, The Berkshire Group, Prudential Securities, the American Association of Independent Investors, Dynamic Mutual Fund, AIC Canada, Analyst PLC London, and Harvard Alumni. She is a recognized authority on the investment methods and philosophy of Warren Buffett, the world's most successful investor, and knew him up close for twelve years, as his daughter-in-law. She learned the essence of his unique contrarian value investor approach, how to communicate and teach it, and has documented her understanding in a series of best-selling books.