I honestly have no idea. I did a quick search and I couldn't find any notable further works on neurosis in the field of psychoanalysis (perhaps E.Fromm, Adler? But this is the same generation). Surely other branches of psychology keep studying the subject.
To me personally, Horney's observations felt enough accurate and complete, so I wasn't really looking for other books on the subject.
The book attempts to describe the complete process of neurotic personality development: how and why it starts, how it affects a person's behavior and life choices. It's full of references to real-life cases Horney encountered as a psychoanalyst.
Many concepts presented in this book where a revelation to me, and I believe it significantly deepened my understanding of myself and human psychology in general.
I think anyone could benefit from reading this, because even if you're not neurotic at all, you will inevitably meet someone who is.
The constructions I have described show how to make precise mathematical sense of the Buddhist views. This does not, of course, show that they are true.
https://www.amazon.com/Shallows-What-Internet-Doing-Brains/d...