Dora L. Costa (born 1964) is an American economics professor at the University of California, Los Angeles where she is the Kenneth L. Sokoloff Professor of Economic History. She is also the department chair of the economics department. In addition to her teaching position, Costa is a research associate at the National Bureau of Economic Research (NBER).She is married to fellow economist Matthew Edwin Kahn who is a professor at the University of Southern California's economics department and a Bloomberg Distinguished Professor at Johns Hopkins University's Economics Department and Business School. Source: Wikipedia (en)