For 24 years, the editor and publisher Katrina vanden Heuvel has been the public face of The Nation, the oldest continuously published weekly in the United States. On June 15, she will give up her job as day-to-day editor, and be succeeded in the role by D. D. Guttenplan, an author long associated with the magazine.

“It’s possible to stay in a job too long,” Ms. vanden Heuvel said in an interview. “It’s a time of tectonic shifts, and a new editor is part of the change that I think is important to continue The Nation’s work as a place of progressive ideals and ideas.”

The second woman to edit The Nation, Ms. vanden Heuvel, a part owner of the publication, will stay on as publisher and continue to provide advice to the editorial staff as editorial director, the magazine said on Monday.

Since its founding by Republican abolitionists in 1865, The Nation has published work by, among others, James Baldwin, Noam Chomsky, Eric Foner, Henry James, Toni Morrison and I. F. Stone. Its circulation peaked at 186,000 in 2006 and has since settled at about 132,000, although its online traffic has been growing steadily. It endorsed Bernie Sanders in the 2016 presidential election.