Analyze the relationship between 'Warren Buffett' and 'Berkshire Hathaway' within the context of the input sentence.
Options: member of, employer, original broadcaster, owner of

Legendary US investor Warren Buffett -- in a 2011 letter to shareholders of his Berkshire Hathaway investment group -- famously compared the entire world's gold stock of 170,000 metric tons, valued at $9.6 trillion (pile A) with another set of assets costing an equal amount (pile B).
owner of