Stephen B. Burke has been a director of Berkshire Hathaway since 2009. He was Chairman and Chief Executive Officer of NBCUniversal, a media and technology company, from 2011 through 2020, and President of Comcast Cable from 1998 until 2011. In 2020 he founded Madison Valley Partners, which invests in Rocky Mountain-area and outdoor-oriented companies. He is a director of JPMorgan Chase & Co. and was a director of Snowflake Inc. from May 2023 through May 2024.