Recently a key trend in organizational innovation research can be found at the network level. It has been argued that due to the rapidly changing economic environment firms rely more than ever on others, hence the recent trend of network level research. Whilst most research mainly focuses on formal networks, not much attention is given yet to informal knowledge networks, yet they seem to have a significant value for firm’s organizational innovation capabilities. Furthermore, we still lack an in-depth understanding of the micro foundations in informal knowledge networks. This dissertation explores those micro foundations further. Concretely, the dissertation provides an in-depth discussion on the knowledge mechanisms as well as the orchestration role (s) and activities in informal knowledge networks using a knowledge-based view. In this regard, the dissertation has the intention to add to literature on knowledge networks, knowledge management literature as well as organizational innovation literature.