What to know about Greg Abel, the CEO Berkshire Hathaway's board voted unanimously to replace Warren Buffett

Warren Buffett said on Saturday he will step down as the CEO of Berkshire Hathaway by year's end. - The board has voted to make Greg Abel, now a vice chair at the company, its CEO and president. - Abel is expected to maintain Buffett's existing investment approach. Hours after Warren Buffett…