Mr. Carlson has not commented on the matter since Mr. Neff resigned. Ms. Scott and Mr. Wallace wrote in their memo that Mr. Carlson would address the episode on his Monday show.
Mr. Neff did not respond to inquiries for comment.
His posts there mocked and denigrated African-Americans, Asian-Americans and women, and he contributed to message threads in which other writers used racial slurs. He also occasionally bragged about his influence on Mr. Carlson’s show.
CNN identified Mr. Neff as the author of the posts and first reported his resignation on Friday.
Mr. Neff, in a recent interview with the Dartmouth Alumni Magazine, said that when Mr. Carlson read off his teleprompter, “the first draft was written by me.” He told the magazine that he and Mr. Carlson agreed on many issues and that he enjoyed working at a show that could affect national politics.
“We’re very aware that we do have that power to sway the conversation, so we try to use it responsibly,” Mr. Neff told the magazine, which identified him as a 2013 graduate and a former editor at The Dartmouth Review, the college’s undergraduate conservative newspaper. (As of Saturday, the Dartmouth Alumni Magazine appeared to have removed the article about Mr. Neff from its website.)