In 1986, Warren Buffett bought a 400-acre Nebraska farm for $280,000; nearly 40 years later, his son is still farming and championing soil conservation

• Howard has served on Berkshire Hathaway's board since 1993 and has also held senior corporate positions.
• Warren Buffett spent decades building one of the world's biggest business empires.
• His middle son, Howard Graham Buffett, chose a very different path.