Chad Fredrick Wolf is an American former government official and lobbyist. He served as the acting United States secretary of homeland security from November 2019 until his resignation on January 11, 2021. His appointment was ruled unlawful in November 2020 by District Judge Nicholas Garaufis, who also overturned a set of Wolf's orders. Wolf also held the position of Under Secretary of Homeland Security for Strategy, Policy, and Plans from 2019 to 2021.