Holger Patzelt is a senior research fellow at the Max Planck Institute of Economics in Jena, Germany. His research focuses on high technology entrepreneurship with a particular emphasis on strategic alliances and human capital. He has published in leading journals of natural sciences and social sciences. He holds a PhD in life sciences from the University of Heidelberg, Germany, and a PhD in management from the University of Bamberg, Germany. Thomas Brenner is associate director of the Max Planck Institute of Economics in Jena, Germany, and lecturer at the University of Jena. His research focuses on the spatial distribution of industry activities and local clustering. He has published a book on "Local Industrial Clusters: Existence, Emergence and Evolution" and many papers in leading economic and geographic journals. He holds a PhD in physics from the University of Stuttgart, Germany, and a PhD in economics from the University of Jena, Germany.