Refer to the input text as context and select the correct relationship between 'Berkshire Hathaway' and 'Warren Buffett' from the available options.
Options: director/manager, location of formation, chairperson, manufacturer

Bloomberg by Sonali Basak Weeks from his 85th birthday, Warren Buffett is again seeking to reshape Berkshire Hathaway with the next few decades in mind.
chairperson