Joseph Cullen is a Senior Economist at Amazon. He was a fellow with the Harvard University Center for the Environment. His faculty advisor was Prof. Ariel Pakes, the Steven McArthur Heller Professor of Economics in the Harvard's economics department. Joseph studies the interaction between government regulation, business decisions, and the environment. Joseph graduated with a B.A. in international studies from the University of Idaho in 2002. He then worked for two years as a GIS analyst with the GAP analysis project, a federal biodiversity initiative aimed at keeping common species common. He started in the economics program at the University Arizona in 2004, completing an M.S. in 2006 and a Ph.D. in 2009, both in economics. For his doctoral dissertation, Joseph modeled the effect of wind power investments on outcomes in the Texas electricity grid. As an Environmental Fellow, Joseph studied the relationship between firm behavior and environmental policy in an empirical setting. An immediate extension of his current research is to understand the long-run implications of wind power in generating capital on electricity grids using a dynamic model of investment.