User centric personalization plays an important role for the adoption of proactive applications. However, stipulating system support to facilitate personalization features in proactive applications generically is still an open issue. In this paper we have addressed this particular issue and presented Persona, a tool that enables adding personalization features in proactive applications in a generic manner. A key feature of Persona is portability that allows it to be injected in various pervasive middlewares as a plug-in. Consequently, existing proactive applications can easily be extended with Persona for personalization support. We have discussed the design and implementation rationale behind Persona and shown it's direct implications with two different middlewares and several proactive applications.