Lovecraft Mythos - Cosmic Horror

Yep. But was married to a Jewish woman for 13 years. Supposedly at the end of his life it wasn't quite as egregious, although still pretty bad.

With the high-grade alien races we can adopt a policy of flexible common-sense—discouraging mixture whenever we can, but not clamping down the bars so ruthlessly against every individual of slightly mixed ancestry. As a matter of fact, most of the psychological race-differences which strike us so prominently are cultural rather than biological. If one could take a Japanese infant, alter his features to the Anglo-Saxon type through plastic surgery, & place him with an American family in Boston for rearing—without stemming him that he is not an American—the chances are that in 20 years the result would be a typical American youth with very few instincts to distinguish him from his pure Nordic college-mates. The same is true of other superior alien races including the Jew—although the Nazis persist in acting on a false biological conception.

H. P. Lovecraft to Natalie H. Wooley, 22 Nov 1934, Letters to Robert Bloch and Others 200-201

That would have been about 2.5ish years before his death. So it shows that he is, in fact, still racist towards the end but not quite as bad as he was early in his career when he was so far beyond the racism of the day that other racists had to pull him back.

I think his time in New York had a lot to do with it. However, it took a toll on his mental health so he went back to WhitefolkIngton.