Warren Buffett is known for his long-term value investing approach and being one of the most successful investors in the world. He only invests in companies he understands and believes in for long-term growth. Some of his major investments include American Express, Coca-Cola, and Berkshire Hathaway. Buffett sat out the dot-com boom and instead invested in stable "cigar butt" companies. He is now the third richest man in the world and donates much of his wealth to the Bill and Melinda Gates Foundation.