David Longly Bernhardt is an American lawyer who served as U.S. Secretary of the Interior from 2019 to 2021 during the presidency of Donald Trump. From 2017 to 2019, he served as the deputy secretary of the interior. Before serving in the Trump administration, he was a shareholder at the Colorado law firm Brownstein Hyatt Farber Schreck, where he was an oil and energy industry lobbyist and natural resources attorney. He began working for the United States Department of the Interior (DOI) in 2001, and served as the department's solicitor from 2006 to 2009, among other roles.