This paper presents the findings from a qualitative study on the extent to which three dimensions of proximity -geographic, cognitive, and organisational -impact knowledge transfer and innovation post-merger and acquisition (M&A). Findings show that the elements of proximity substantially influence both knowledge transfer and innovation although the nature of the impact varies and is influenced by the type of management interventions or lack thereof post-M&A.Keywords: proximity; knowledge transfer; mergers and acquisitions; M&A; technology management; innovation; post-M&A.Reference to this paper should be made as follows: Ensign, P.C., Lin, C-D., Chreim, S. and Persaud, A. (2014) Samia Chreim is an Associate Professor in the Telfer School of Management at the University of Ottawa. Her research interests include the areas of mergers and acquisitions, cross-organisational collaborations, and change management. She has studied these topics in the fields of healthcare, financial services, engineering and information technology. Her most recent research attends to the notion of boundaries at different levels of analysis.Ajax Persaud is an Associate Professor in the Telfer School of Management at the University of Ottawa. His research focuses on the commercialisation of new technologies, R&D and innovation management, new product development, technology adoption, and e-business. He has received a number of nominations and awards for teaching and research excellence. He has provided management consulting services to small and medium companies and community organisations in Canada and the Caribbean. He has also delivered executive education courses in innovation management, marketing, and e-business to executives of small, medium, and large multinational corporations in Canada, the Caribbean and Europe.