I recently completed a research monograph, ​​​​​​What Functions Are and Why They Matter. It was published by Cambridge University Press in early 2019. It sets out my theory of biological functions and explores its relevance for various problems in the philosophy of science, philosophy of mind, and philosophy of medicine. It serves as a companion volume to my last book,  A Critical Overview of Biological Functions , which was a short, opinionated survey of the functions debate.  
I’m also in the early stages of writing a book on the history and philosophy of psychiatry, ​Mad by Design: Rethinking the Philosophy of Psychiatry. I'm starting a one-year sabbatical (academic year 2019-2020) to work on it. You can find some notes here .

Finally, I'm starting to explore teleosemantics more systematically. This is the idea that mental representation can somehow be understood in terms of biological functions. A recent paper in this area, co-authored with David Papineau, can be found here .