Who is Greg Abel, the heir apparent to Warren Buffett at Berkshire Hathaway?

Source: Business Insider

Greg Abel is Warren Buffett's choice to succeed him as CEO of Berkshire Hathaway next year. Berkshire Hathaway EnergyWarren Buffett said he will step down as CEO of Berkshire Hathaway by year's end. Buffett said he hopes Greg Abel, now a vice chair at the company, will take over.