Warren Buffett: These 2 Men May Succeed Him at Berkshire Hathaway

Meet the two immigrants who may follow world's third-richest man Warren Buffett.

Alongside Buffett's annual letter to shareholders released on Saturday, Berkshire's vice chairman Charlie Munger named two candidates -- the company's reinsurance chief, Ajit Jain, and the head of its utility company, Greg Abel.

Munger wrote that the two "are proven performers who would probably be under-described as 'world-class.' 'World-leading' would be the description I would choose. In some important ways, each is a better business executive than Buffett."

Here's more about the men who could succeed the third-richest man in the world:

1. Ajit Jain

"Ajit insures risks that no one else has the desire or the capital to take on," Buffett wrote in Berkshire's annual report. "His operation combines capacity, speed, decisiveness and, most important, brains in a manner unique in the insurance business. Yet he never exposes Berkshire to risks that are inappropriate in relation to our resources."

Berkshire's board discusses the succession plan at every meeting and knows the company, Buffett told CNBC. The investing guru has stated he wants his son Howard to succeed him as non-executive chairman of Berkshire's board.

2. Gregory Abel

He's been called Buffett's "go-to energy guy" -- and Abel is proud of it.

With billions of Berkshire's money invested in projects like wind-farms in Iowa, even that state's driver’s licenses now have wind turbines in the background.

Like Ajit, Abel is an immigrant to the U.S.