In the context of the input sentence, determine the relationship between 'Warren Buffett' and 'Berkshire Hathaway'.
Options: product/material produced, headquarters location, owner of, director/manager

Home / Nation & World / Berkshire buying Precision Castparts for $32B Berkshire Hathaway Chairman and CEO Warren Buffett speaks May 5, 2014, during an interview with Liz Claman on the Fox Business Network in Omaha, Nebraska.
owner of