Priscilla Chan is an American pediatrician and philanthropist. She is married to the co-founder and CEO of Facebook, Mark Zuckerberg. Born and raised in Massachusetts, she attended Harvard University for undergrad and received her medical degree from the University of California, San Francisco (UCSF). In December 2015, Chan and Zuckerberg pledged to donate 99 percent of their Facebook shares, valued at $45 billion, to the Chan Zuckerberg Initiative, a political action company that focuses on health and education. As of 2016, they have pledged more than $4.6 billion to charities.