Christopher Callahan is an assistant professor at the Paul H. O’Neill School of Public and Environmental Affairs at the Indiana University. Callahan is a climate scientist whose work focuses on the economic and social impacts of climate change. He uses tools from both physical climate science and quantitative social science to assess how to extreme climate events such as heat waves and El Niño events affect human health and economic growth around the world. He has also worked to develop quantitative frameworks for climate accountability, showing how major countries and fossil fuel firms have altered local climate, and amplified the resulting social impacts across the globe. Before coming to Indiana University, he received his PhD from Dartmouth College and worked as a Postdoctoral Scholar at Stanford University.