As we hinted earlier, the columnist rotation changes. Out are Erin Aubry Kaplan (as reported previously), Max Boot and Jonathan Chait. Meghan Daum escapes the Saturday ghetto for Mondays. Also, the Times opinion pages clarify the title of contributing editor, a group that includes Arianna Huffington, D.J. Waldie and Sandra Tsing Loh. Memo from Andrés Martinez:

As David Hiller announced last week, Ron Brownstein is joining the opinion pages as National Affairs Columnist. His column will appear Wednesdays on the op-ed page, starting next week. Ron will write additional online-only columns and articles for the Sunday Current section. It goes without saying that I am thrilled to have one of the finest political analysts of our generation writing for our pages, and for latimes.com/opinion.

There are some other changes in our columnist line-up. Beginning this weekend, the new weekly schedule of op-ed columnists will now be as follows:

Sunday -- Gregory Rodriguez and Niall Ferguson

Monday -- Meghan Daum

Tuesday -- Jonah Goldberg

Wednesday -- Ron Brownstein

Thursday -- Patt Morrison

Friday -- Rosa Brooks and Joel Stein

We are also bolstering the ranks of our contributing editors. These are writers with whom we have a close relationship and will publish on a regular basis. Erin Aubry Kaplan, Jonathan Chait and Max Boot, although they will no longer appear weekly, have agreed to become contributing editors. Our other contributing editors are:

GUSTAVO ARELLANO, a staff writer with O.C. Weekly, writes the nationally syndicated "¡Ask a Mexican!" column. The columns will be published in book form on Cinco de Mayo 2007. In addition to the column, his commentaries on Latino culture and politics appear regularly on National Public Radio and in the San Francisco Chronicle.

TIMOTHY GARTON ASH, a winner of the George Orwell Prize for political writing, is the author of eight books on European politics. He teaches European Studies at Oxford and is a senior fellow at the Hoover Institution. His weekly column for the Guardian is syndicated around the world.

IAN BURUMA, a former filmmaker, spent a decade working as a journalist in Asia, including a stint as cultural editor of the Far Eastern Economic Review. He contributes to The New York Review of Books, the New Yorker, the New York Times, the Guardian, and the Financial Times. His latest book is "Murder in Amsterdam: The Death of Theo van Gogh and the Limits of Tolerance."

DENISE DRESSER, a professor of political science at the Instituto Tecnológico Autónomo de México and a Senior Fellow at the Pacific Council, is one of Mexico’s foremost political analysts. The author of numerous articles and monographs on Mexican politics and U.S.-Mexico relations, she writes a political column for the Mexico City newspaper Reforma and makes frequent appearances on Mexican TV and radio news programs.

ADAM HOCHSCHILD, an award-winning author and essayist, is a co-founder of Mother Jones magazine and a teacher of writing at UC Berkeley. His work has appeared in many newspapers and magazines including Harper’s, Granta, and the New Yorker.

ARIANNA HUFFINGTON is co-founder and editor-in-chief of The Huffington Post, a widely read and cited news and blog site. She writes a nationally syndicated column and co-hosts public radio’s "Left, Right & Center." Her most recent book is "On Becoming Fearless?in Love, Work and Life."

TAMAR JACOBY, a senior fellow at the Manhattan Institute, has written two books on immigration and race, including "Reinventing the Melting Pot: The New Immigrants and What It Means To Be American," and sits on the National Council of the Humanities.

SANDRA TSING LOH is a writer/performer whose solo shows include "Mother on Fire." Loh’s books include "A Year in Van Nuys," "Aliens in America," "Depth Takes a Holiday: Essays From Lesser Los Angeles," and a novel, "If You Lived Here, You’d Be Home By Now," which was named by the Los Angeles Times as one of the 100 best fiction books of 1998. She is a regular radio commentator on NPR, and a contributing editor for The Atlantic Monthly.

ROB LONG, a writer and producer, began his career writing on TV's long-running "Cheers," and served as co-executive producer in its final season. He is a contributing editor of National Review and Newsweek International and writes occasionally for the Wall Street Journal. His weekly radio commentary, "Martini Shot," is broadcast on public radio. He is the author of "Conversations with My Agent," and "Set Up, Joke, Set Up, Joke."

SERGIO MUÑOZ, a former Los Angeles Times editorial board member and executive editor of La Opinion, writes a column syndicated throughout Latin America. He has long been involved with the Inter American Press Association, and currently serves as the chair of the Chapultepec Committee.

BILL STALL spent thirty years working as a Los Angeles Times reporter and editorial writer. He won the Pulitzer Prize for Editorial Writing in 2004 for his pieces on California’s state government. He is now a special consultant with the Center for Collaborative Policy, and is developing strategy for the Sierra Nevada Conservancy.

LAWRENCE SUMMERS, President Emeritus of Harvard University, is a long-time economics professor at that university. Summers, a member of the National Academy of Sciences, served as the World Bank’s chief economist from 1991 to 1993; as Undersecretary of the Treasury from 1993 to 1995; deputy undersecretary from 1995 to 1999 and Secretary of the Treasury in 1999-2000.

DJ WALDIE is the Public Information Officer for the city of Lakewood, his hometown and the subject of his book, "Holy Land: A Suburban Memoir." He has written several books about Los Angeles and also contributes to Los Angeles Magazine, L.A. Weekly, and the New York Times.

I am excited that these bylines will regularly enrich our opinion pages.

Andres Martinez