He received his Ph.D. in Economics from New York University, where he was lucky enough to be advised by neuroscientists as well as economists. Subsequently, Mark has worked largely in the field of behavioral economics, using tools from decision theory and experimental economics to devise and conduct robust tests of behavioral economic models. His most recent work is in the area of 'rational inattention', which aims to understand how people allocate scarce cognitive resources when making economic choices. At Columbia, Mark is a member of the Cognition and Decision Lab (with Mike Woodford and Hassan Afrouzi) and is the associate director of the Columbia Experimental Laboratory in the Social Sciences.