Paul Kersey is the pseudonym for the white nationalist and conspiracy theorist who runs the blog Stuff Black People Don’t Like, where he advocates for racial separation. The name “Paul Kersey” is of course borrowed from Charles Bronson’s character in the Death Wish series. We are not going to speculate about the author’s real name.
Kersey seems to have gained a bit of a name for himself in altright circles. For the 2016 election he was a giddy supporter of Donald Trump, saying of his immigration speech that it “was a complete repudiation of ‘The New Colossus’ that was regrettably placed on the Statue of Liberty in 1903,” referring to the Emma Lazarus poem welcoming “your tired, your poor, your huddled masses yearning to breathe free.” Outside of the altright movement Kersey is probably most famous for claiming that the Oklahoma City bombing was a false flag operation to smear the militia and the anti-immigrant movement.
Diagnosis: Insane, mush-headed racist and bigot. Probably only moderately influential, but there are many of these people out there, so one can’t just dismiss the movement either.