This paper presents a model of innovation, knowledge brokering, that explains how some organizations are able to routinely innovate by recombining their past knowledge in new ways. While existing theories of organizational learning and innovation are useful, the links between them are crucial for understanding how existing knowledge becomes the raw materials from which individuals in organizations construct innovative solutions. This model develops these links by grounding processes of learning and innovation in the larger social context within which they occur. Using a microsociological perspective, this article draws together research spanning levels of analysis to explain innovation as the dissembling and reassembling of extant ideas, artifacts, and people. Previous research has suggested that firms spanning multiple domains may innovate by moving ideas from where they are known to where they are not, in the process creating new combinations of existing ideas. This paper more fully develops this process by linking the cognitive, social, and structural activities it comprises. Knowledge brokering involves exploiting the preconditions for innovation that reside within the larger social structure by bridging multiple domains, learning about the resources within those domains, linking that knowledge to new situations, and finally building new networks around the innovations that emerge from the process. This article also considers the origins of knowledge brokers as firms committed to this innovation strategy, the structural and cultural supports for the knowledge brokering process, and several obstacles to the process that these firms experience. Finally, I discuss the implications of this model for further research on innovation and learning, and the implications for other organizations seeking to establish their own capabilities for brokering knowledge.