Priscilla Chan (born 1985) is an American pediatrician and philanthropist. She is the wife of Mark Zuckerberg, the co-founder and CEO of Facebook. As of 2015, she and her husband have pledged more than $1.6 billion to charities. In December 2015, they pledged to donate 99% of their Facebook shares, valued at $45 billion, to the Chan Zuckerberg Initiative, a philanthropic and political action company that focuses on health and education.