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).
Analyze the relationship between 'Berkshire Hathaway' and 'Warren Buffett' within the context of the input sentence.
Options: founded by, publisher, chairperson, manufacturer