Priscilla Chan is an American pediatrician and philanthropist, currently serving as Co-CEO of the Chan Zuckerberg Initiative (CZI). She co-founded CZI in December 2015 with Mark Zuckerberg, pledging to transfer 99 percent of their Meta Platforms shares, then valued at $45 billion, to venture capital and philanthropic initiatives. CZI aims to advance human potential and promote equality in areas such as science, education, and justice.