Ned Hall is Professor of Philosophy at Harvard University. He works mainly on metaphysics and philosophy of science, with a special emphasis on philosophical problems associated with the foundations of quantum physics. His current interests in the philosophy of science center on the analysis of natural laws and their role within scientific theories. His other work has included investigations into the connections between probability theory and the logic of conditionals, the epistemology and metaphysics of objective probability, and the analysis of causation. He recently edited (with John Collins and L. A. Paul), Causation and Counterfactuals.