Such little expertise as I had is now fading. Since retirement some years ago, I've had little incentive to keep the mind ticking over and, more to the point, I no longer have ready access to useful libraries (the old, hard copy things now going out-of-fashion). I'll chip in at a conceptual level on many academic topics because that knowledge hasn't gone past its sell-by date, but don't expect anything terribly contemporary out of me. I'm reasonably good on music and some genres of fiction and, of course, my search skills on the net are quite good.
If I get things wrong, just tell me. Otherwise, I'll just potter along as a bottom feeder, hoping no-one will notice me too much.