Jacob Jeremiah Sullivan is an American attorney serving since 2021 as the U.S. National Security Advisor. He previously served as Director of Policy to President Barack Obama, National Security Advisor to then-Vice President Biden and Deputy Chief of Staff to Secretary Hillary Clinton at the U.S. Department of State. Sullivan also served as senior advisor to the U.S. federal government at the Iran nuclear negotiations and senior policy advisor to Clinton's 2016 presidential campaign, as well as visiting professor at Yale Law School. On November 23, 2020, President-elect Biden announced that Sullivan would be appointed the United States National Security Advisor. He took office on January 20, 2021.