John Horty effectively develops deontic logic (the logic of ethical concepts like obligation and permission) against the background of a formal theory of agency. He incorporates certain elements of decision theory to set out a new deontic account of what agents ought to do under various conditions over extended periods of time. Offering a conceptual rather than technical emphasis, Horty's framework allows a number of recent issues from moral theory to be set out clearly and discussed from a uniform point of view.About the Author: John Horty is a Professor in the Philosophy Department and the Institute for Advanced Computer Studies at the University of Maryland. He is the author of Frege on Definitions (Oxford, 2007) as well as papers on a variety of topics in logic, philosophy, and computer science.