Warren Buffett steps down as chairman of Berkshire Hathaway

By Chris Isidore, CNN (CNN) — Warren Buffett, who ended his decades-long tenure as CEO of Berkshire Hathaway at the end of last year, is giving up the chairman post he has held since 1970. Buffett, 96, will remain on the board to serve as chairman emeritus. His son Howard, a board member since 1993,