Ulrich Krohs is a Privatdozent of philosophy at the University of Hamburg. He studied biochemistry and philosophy at Tübingen, Brighton, Aachen, and Hamburg, and holds a PhD from the Technical University of Aachen (1994), resulting from his research on phototaxis of Halobacterium at the Jülich Research Centre. He obtained his Habilitation in Philosophy at Hamburg University in 2004. His current research topics are the notions of biological function and design, and the structures of biological theories and of descriptions of technical artefacts.