In the investing world, Warren Buffett has arguably been consistently successful over several decades and has shared the investing philosophy that helped make him successful. One of the world's wealthiest people, Buffett still plays a significant role in determining what his holding company, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), buys and sells. While investors shouldn't mindlessly copy what others do because everyone has unique investing goals, Buffett's reputation and buy-and-hold philosophy make Berkshire an excellent source for stock ideas for a broad range of investors.