Arnab Bhattacharjee is a professor of economics at Heriot-Watt University. He works primarily in applied econometrics, focusing on foundations and methods to analyse spatial, panel and cross-section data, and with applications to several areas within the disciplines of economics and allied social sciences. Mark Schaffer is also a professor of economics at Heriot-Watt, His fields of research include transition and emerging economies, labor markets, applied econometrics, economic history, quantitative criminology and energy economics.