My research persona is a historian of 17th Century Philosophy (with a special focus on the philosophy of G. W. Leibniz). I am editor and translator of The Leibniz-De Volder Correspondence (Yale, 2013); editor of Leibniz and His Correspondents (Cambridge, 2004) and Locke and Leibniz on Substance (Routledge, 2015 - with Tom Stoneham); and author of numerous articles on the philosophy of Leibniz. I am currently working on an edition and translation of Leibniz’s philosophical journal articles and co-editing (with Lloyd Strickland) a collection of papers introducing Leibniz's major writings (both for OUP). I have a general (but more ignorant) interest in the histories of modern German and Jewish philosophy (particularly Martins Buber and Heidegger), and 19th Century British philosophy (particularly T H Green). I also have perennial 'non-historical' interest in philosophical theology, the foundations of normativity and philosophical methodology.