Refer to the input text as context and select the correct relationship between 'Berkshire Hathaway' and 'Warren Buffett' from the available options.
Options: industry, chairperson, member of, position held

With the $37.2 billion deal to buy Precision Castparts (NYSE: PCP - news ) announced Monday, US investment guru Warren Buffett is extending his storied Berkshire Hathaway (Sao Paolo: BERK34.SA - news ) holding company.
chairperson