NEW YORK (Reuters) - Warren Buffett, the billionaire chief executive of Berkshire Hathaway Inc, told investors on Saturday that the company had found his successor, and the company's vice chairman, Charlie Munger, identified two Berkshire executives as candidates. In Berkshire's annual report to shareholders, Greg Abel, the head of Berkshire's energy companies, and Ajit Jain, a top insurance executive, were said by Munger to be "proven performers who would probably be under-described as 'world-class.'" "'World-leading' would be the description I would choose," Munger said in a letter to Berkshire shareholders.