Max is Mark Zuckerberg 's first daughter .
On December 1 , 2015 , Zuckerberg and Chan announced the birth of their first daughter Max , and in an open letter to Max , they pledged to donate 99 percent of their Facebook shares , then valued at US $ 45 billion , to the Chan Zuckerberg Initiative , their new organization that will focus on health and education .
Mark Zuckerberg