A columnist is a journalist who writes for publication in a series, creating copy that can sometimes be strongly opinionated. Columns appear in newspapers, magazines and other publications, including blogs on the Internet. Readers often open a publication with an expectation of reading a new essay by a specific writer who offers a personal point of view. Some columnists appear on a daily basis and later reprint the same material in book collections.

Notable contemporary columnists include Gail Collins, Ardeshir Cowasjee, E. J. Dionne, Maureen Dowd, Thomas Friedman, Ellen Goodman, Bob Herbert, David Ignatius, Molly Ivins, Charles Krauthammer, Nicholas D. Kristof, Paul Krugman, Clarence Page, Chandrakant Lahariya, Rick Reilly, Frank Rich, Al Lewis and Mike Royko.

In defining a column, Dictionary.com provides a breakdown of a few popular subjects covered by columnists:

A regular feature or series of articles in a newspaper, magazine, or the like, usually having a readily identifiable heading and the byline of the writer or editor, that reports or comments upon a particular field of interest, as politics, theater, or etiquette, or which may contain letters from readers, answers to readers' queries, etc.

Radio and television

Newspaper columnists of the 1930s and 1940s, such as Franklin Pierce Adams (aka FPA), Nick Kenny, Jimmie Fidler, Walter Winchell. Louella Parsons, Drew Pearson, Ed Sullivan and Walter Winchell, achieved a celebrity status and used their syndicated columns as a springboard to move into radio and television. In some cases, such as Winchell and Parsons, their radio programs were quite similar in format to their newspaper columns. Rona Barrett began as a Hollywood gossip columnist in 1957, duplicating her print tactics on television by the mid-1960s. One of the more famous syndicated columnists of the 1920s and 1930s, O. O. McIntyre, declined offers to do a radio series because he felt it would interfere and diminish the quality of writing in his column, "New York Day by Day."

Books

However, FPA and McIntyre both collected their columns into a series of books, as did other columnists. McIntyre's book, The Big Town: New York Day by Day (1935) was a bestseller. FPA's The Melancholy Lute (1936), collected selections from three decades of his columns. H. Allen Smith's first humor book, Low Man on a Totem Pole (1941) and his two following books were so popular during World War II that they kept Smith on the New York Herald Tribune's Best Seller List for 100 weeks and prompted a collection of all three in 3 Smiths in the Wind (1946). While Smith's column, The Totem Pole, was syndicated by United Features, he told Time:

Just between you and me it's tough. A typewriter can be a pretty formidable contraption when you sit down in front of it and say: "All right, now I'm going to be funny."