A Plano man who formerly wrote for The Dallas Morning News and D Magazine, among other publications, hosts a podcast devoted to white supremacy and has a history of using social media to target people of color, women and journalists, according to a report by the Southern Poverty Law Center.

A post on the nonprofit group's Hatewatch blog Friday identified 49-year-old Norman Asa Garrison III — who writes under the name Trey Garrison — as the pseudonymous host "Spectre" of Third Rail, a show that calls itself the "most huggable podcast" of the alt-right movement.

He has not been published in The News since 2010.

"Trey Garrison came to us as a libertarian writer expressing carefully couched opinions about everything from diversity to rural life to running marathons," said Mike Wilson, editor of The News. "His last op-ed for us ran almost nine years ago. Hatewatch has done good work exposing his overtly racist and misogynistic views. We haven't missed him and will never have him back."

Garrison's former girlfriend told Hatewatch that she knew him to be Spectre, and two of his former colleagues identified the voice on the podcast as Garrison's, according to the report.

Garrison contributed opinion pieces to The News from 2008 to 2010. One of his op-eds, titled "Why I don't want diversity in my neighborhood," was later republished in the white-supremacist magazine American Renaissance.

In the piece, Garrison wrote that he wasn’t “entirely sold” on diversity being inherently good:

Look, diversity is great when it comes to nightclubs, workplaces, cultural experiences, restaurants and all that. But I don't want diversity in my neighborhood.

Now, put down the pitchfork. I don't mean the superficial diversity of skin color. I mean diversity of values. That's what I don't want in my neighborhood, or my neighborhood school.

I want uniformly boring neighbors with uniformly boring, middle-class values who spend Saturdays working on their lawns and whose kids know to stay off mine. I want neighbors with Home Depot on speed dial. That's how I choose to live. Your mileage may vary.

Garrison also worked as a contributing editor for D Magazine and contributed to Reason magazine and The Land Report.

"It has been a long time since he has written anything for us. The longer that period grows, the happier I am," said D Magazine's editor, Tim Rogers. "I deeply regret that he ever had an association with D Magazine."

According to the Hatewatch report, Garrison operated at least 20 accounts on Twitter through which he wrote racist and misogynistic statements — referring to people of color as “cockroaches,” in one example.

During the fatal June 2018 shooting at the Capital Gazette newspaper in Annapolis, Md., Garrison replied to one reporter's tweeted plea for help with a meme that said, simply, "No," and later asked whether "it's only journalists or any real people" who got hurt, Hatewatch reported.

Garrison did not respond to a request for comment Friday evening. Hatewatch reported that he admitted to hosting Third Rail but said harassment from his Twitter accounts was the fault of his "assistants" who ran them.