Barbara Pierce Bush is an American activist and author. She co-founded and is the chair of the board of the nonprofit organization Global Health Corps. She and her fraternal twin sister, Jenna, are the daughters of the 43rd U.S. president George W. Bush and former first lady Laura Bush. She is also a granddaughter of the 41st U.S. president, George H. W. Bush, and former first lady Barbara Bush, after whom she is named.