Just this week, the writer, Blake Neff, responded to a thread started by another user in 2018 with the subject line, "Would u let a JET BLACK congo n****er do lasik eye surgery on u for 50% off?" Neff wrote, "I wouldn't get LASIK from an Asian for free, so no." (The subject line was not censored on the forum.) On June 5, Neff wrote, "Black doods staying inside playing Call of Duty is probably one of the biggest factors keeping crime down." On June 24, Neff commented, "Honestly given how tired black people always claim to be, maybe the real crisis is their lack of sleep." On June 26, Neff wrote that the only people who care about changing the name of the NFL's Washington Redskins are "white libs and their university-'educated' pets."

And over the course of five years, Neff has maintained a lengthy thread in which he has derided a woman and posted information about her dating life that has invited other users to mock her and invade her privacy.

In the acknowledgments, Carlson said that Neff and two others who helped with the book "work on and greatly improve our nightly show on Fox."

During the years that Neff wrote for him at Fox, Carlson has hosted one of the most influential shows on cable news.

He has spent years posting about history, offering his political opinions, and detailing aspects of his personal life.

After learning of Neff's posts on the board through an email from an anonymous tipster, CNN Business was able to positively identify CharlesXII as Neff by reviewing messages he has posted throughout the years on the forum and matching them up with publicly available information about him.

CharlesXII said he had been working for nearly four years in his current journalism job in Washington DC; Neff has been working for Carlson at Fox in Washington since February 2017, according to his LinkedIn profile, which appears to have been removed after his resignation from Fox News.

Neff, a history buff interested in wars and military battles, has repeatedly disclosed on the forum that he rarely drinks and The Post story said he rarely dates.

Even more clearly identifying, however, were photos that CharlesXII posted to the forum in 2018 to the forum after visiting a museum in Egypt.

He began posting about her in March of this year, in a thread he titled "Disaster: WuFlu outbreak endangers aging shrew's quest to freeze eggs." Neff posted to the thread, which racked up dozens of comments as users ridicule the woman, as recently as June 28.

On the forum, Neff has also expressed bigoted views.

In 2014, he joked about "foodie faggots." And in the same year, he started a thread titled, "Urban business idea: He Didn't Do Muffin!" He joked one item could be, "Sandra Bland's Sugar-free Shortbreads!" In August 2019, a user started a thread titled, "We should just buy Canada and kick the Canadians out." Neff commented, "Okay but what do we do with the millions of Chinese people."

More recently, in February 2020, Neff called Mormonism "an inherently cucky religion." On June 5, a user on the forum commented in a thread, "Didn't Michael Brown rob a store and attack a police officer?

Neff commented on the thread, "And to think, if this guy got killed in some freak incident while being arrested, we'd have to endure at least three funerals in his honor."

On the Fourth of July, Neff started a thread in which he jokingly "rated" members of the community using images from a 1990s video game from the makers of "Oregon Trail" that was pulled from the market due to its racist depictions of slaves.

Alexandria Ocasio-Cortez, Ilhan Omar, Ayanna Pressley, and Rashida Tlaib — known collectively as "The Squad" — want to "MAKE YOUR COUNTRY A DUMPING GROUND FOR PEOPLE FROM THIRD WORLD SHITHOLES." Responding to a thread on June 27 about whether "whites fear what's going to happen to them in 10-20 yrs," Neff wrote that he has "no plans to stay" in the country "that long." In December 2019, he said that "once Democrats have the majorities to go full F**K WHITEY, things are going to get really wacky really quickly." He argued at the time that there is a "large minority of whites who are fully supportive of a F**k Whitey agenda" and that "there's a suicidal impulse to Western peoples that honestly feels almost biological in origin."

When not making his own bigoted comments, Neff has shown a willingness to respond to others who were, without expressing any hesitation, much less disgust, about what they've said.

He wrote on the forum, "Interest in real estate in Bozeman, Missoula, and the Flathead Valley has been on the rise for years." That night, in his monologue, Carlson said, "You're starting to consider maybe moving to Bozeman, and why wouldn't you?"

In some cases, language Neff used on the forum ended up on the show.

The night of June 15, in commenting on a football coach who was the subject of controversy over a sweatshirt he'd worn, Neff wrote on the forum, "[I]t is your f***ing right as an American to wear whatever T-shirt you want, and hold whatever political views you want.

On the afternoon of July 1, Neff started a thread titled, "Two GOP senators propose replacing Columbus Day w/Juneteenth." In the thread, he wrote, "Coming out this afternoon if it isn't out already." That afternoon, it was public; that night, the proposal was discussed on Carlson's show.

-- Additional reporting by CNN's Sergio Hernandez.