The author thanks Joshua Gans, April Franco, Alberto Galasso, Nicola Lacetera, William Kerr, Michel Serafinelli, Kevin Bryan, Peter Thompson, Michela Giorcelli, Joanne Oxley, and participants to presentations at the University of Toronto, University of California Berkeley, University of Michigan, Georgetown University, Georgia Tech, the Roundtable for Engineering Entrepreneurship Research (REER) Conference at Georgia Tech, Tilburg University, KU Leuven, and IESE Business School for helpful comments and suggestions and the Polish Combatants Association (SPK) for sharing their insights. This work includes data provided through www.visionofbritain.org.uk and uses material from the Great Britain Historical GIS Project.