What Even is Gender? is an academic philosophy book written by B. R. George and R. A. Briggs, freely accessible online. Unusually, the book belongs to the analytic philosophy tradition (i.e. the tradition that includes Bertrand Russell and Ludwig Wittgenstein), rather than the continental philosophy tradition (whence comes Judith Butler and Michel Foucault).
The authors take a trans-positive view, while expressing skepticism towards the concept of gender identity. To be clear, they are arguing for conceptual reform rather than language reform—their issue with “gender” is not the way the words are arranged in English, but rather that “gender” presently refers to several distinct concepts, and that the equivocation of these concepts ultimately hurts trans people