We attempt to extend the static analysis of innovator networks by providing case study based insights into the dynamic, developmental or evolutionary pattern of such networks. In the theoretical part, we develop some building blocs that are considered central to a theory of network evolution. Especially, we focus on the growth of innovator networks and their structural change over time, i.e. how new relationships come into existence and existing ties are cut, how new actors join the system, and other actors leave it. The factors shaping these structural properties, can explain how coherence might increase in some periods while it might decrease in others. We exemplify these patterns for the case of the Jena network of innovators during the period 1995-2001.