Lee Kamlet joined ABC's World News with Charles Gibson as head writer.
Kamlet comes to the broadcast after almost 10 years with NBC, where he was a writer and segment producer for Dateline.
Kamlet replaces Josh Landis, who left to become a correspondent at CBS News. Joel Siegel, a writer for World News, had also been picking up the head writing slack since Landis' departure several weeks ago.
It will be a homecoming for Kamlet, who was a producer for World News in the Washington bureau in the 1990s and became senior producer for special events before heading to NBC.
According to an e-mail from World News executive producer Jon Banner, Kamlet will spend the next few days in New Hampshire -- the primary is Tuesday -- "getting into the rhythm" of the show before heading back to New York Wednesday.