Southwestern has a history of drawing prolific lecturers to campus, including William Jennings Bryan, Helen Keller, bell hooks, and alumnus J. Frank Dobie. Orators traveling by train often stopped off on their way to or from Austin, giving their lectures and catching the next train. Speakers at the annual Brown Symposium have included author Isaac Asimov (through a video conference) in the early 1980s and Nobel prize-winning economist Joseph Stiglitz in 2002. Since it began, the Shilling Lecture series has brought a variety of prominent figures, including presidential advisor Karen Hughes (2003), Archbishop Desmond Tutu (2004), former Pakistani Prime Minister Benazir Bhutto (2005), former Governor of New Jersey Thomas Kean (2006), former Secretary of State James Baker (2007), former U.S. senator Bill Bradley (2008), Nobel Peace Prize winner Wangari Maathai (2009), senior fellow in the Bill & Melinda Gates Foundation Global Health Program William Foege (2010), founder of TOMs Shoes Blake Mycoskie (2011), and three-time Pulitzer Prize winner Thomas Friedman (2012). In 2002, The Writer's Voice series presented Pulitzer Prize winning author Michael Chabon. The Writer's Voice has also welcomed such authors as Joyce Carol Oates (2000), Margaret Atwood (2003), Amy Tan (2007), and Azar Nafisi (2008).