Buffett , who is well-known as a long-term investor , is chairman of Berkshire Hathaway Inc , a holding company through which he holds investments in several large U.S. companies .
<response> <person>Buffett</person> , who is well-known as a long-term investor , is chairman of <organization>Berkshire Hathaway Inc</organization> , a holding company through which he holds investments in several large <location>U.S.</location> companies . </response>