Empirical studies on the geography of innovation have established that skilled workers' mobility and collaboration networks shape the diffusion of knowledge across firms and regions. At the same time, the literature on absorptive capacity insisted on the importance of local research capabilities to take advantage of knowledge developed elsewhere. This paper investigates both phenomena in an integrated framework by assuming that mobility and networks provide access to knowledge, but the proportion of accessible knowledge effectively used for innovation depends on absorptive capacity. Such complementaries in regional research efforts are effectively captured using a spatial Durbin model in which the conne ctivity structure stems from mobility and collaboration patterns. Results suggest the relative importance of these two channels in the diffusion of knowledge, and suggests that human capital increases absorptive capacity. These findings have implications for the geography of innovation. While greater accessibility encourages convergence, the notion of absorptive capacity implies a self-reinforcing effect leading to divergence. Abstract Empirical studies on the geography of innovation have established that skilled workers' mo