TIL Lewis Carroll (aka Charles Dodgson) was a mathematician

I’m too lazy to find it right now, but there was a fascinating article from the 90’s I remember reading with a breakdown of the perspective that Through the Looking Glass was a take-down of a lot of the cutting edge mathematical theories being explored in his time.

There's a fascinating annotated edition by mathematician Martin Gardener called The Annotated Alice. He talks about the mathematical underpinnings of the story, as well as a lot of Victorian-era poets and writers who were also an influence.

Am I misremembering, or was he also disturbingly obsessed with an underaged girl?

His math and logic works are a good read. The Game of Logic (1886) for one.