Shane Greenstein Northwestern University   Kellogg School of Management, Northwestern University 2001 Sheridan Road Evanston, IL 60208-2013 USA   greenstein@kellogg.northwestern.edu   http://www.kellogg.nwu.edu/faculty/greenstein/   Biographical Sketch: Shane Greenstein is the Elinor and Wendell Hobbs Professor in the Management and Strategy Department of the Kellogg School of Management at Northwestern University. He teaches courses on strategy in technology-intensive industries and markets.   Primary Research Focus: Empirical industrial economics and innovation   JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General O3 : Technological Change; Research and Development: General