James D. Sinclair

James D. Sinclair is an American researcher and analytic philosopher of religion best known for his work defending and updating the kalam cosmological argument, particularly through engagement with contemporary cosmology. He is most prominent as co-author with William Lane Craig of the lengthy chapter "The Kalam Cosmological Argument" in The Blackwell Companion to Natural Theology (2009), where he developed scientific support drawn from Big Bang cosmology, the Borde-Guth-Vilenkin theorem, and critiques of alternative cosmological models (eternal inflation, cyclic universes, quantum gravity proposals) that attempt to avoid an absolute beginning. Working outside a standard academic post, Sinclair has contributed to subsequent volumes including The Kalam Cosmological Argument, Volume 2: Scientific Evidence for the Beginning of the Universe (2017), surveying the state of physical cosmology with respect to the universe's finite past. His writings combine technical engagement with theoretical physics with the deductive structure of the kalam syllogism. Critics including Wes Morriston, Graham Oppy, and Alex Malpass have challenged both the philosophical premises (impossibility of actual infinites, A-theory of time) and the scientific interpretation Sinclair defends, arguing that contemporary cosmology underdetermines metaphysical conclusions about a beginning. Sinclair's contribution is largely understood as the empirical-scientific complement to Craig's philosophical case for kalam.