Take context from the input text and decide on the accurate relationship between 'Berkshire Hathaway' and 'Warren Buffett' from the options provided.
Options: legal form, developer, chief executive officer, distribution format

View photo A Berkshire Hathaway shareholder poses with a likeness of Berkshire CEO Warren Buffett at the shareholder's shopping day in Omaha, Nebraska May 1, 2015.
chief executive officer