We describe an intelligent personal assistant that has been developed to aid a busy knowl- edge worker in managing time commitments and performing tasks. The design of the system was motivated by the complementary objec- tives of (1) relieving the user of routine tasks, thus allowing her to focus on tasks that critical- ly require human problem-solving skills, and (2) intervening in situations where cognitive over- load leads to oversights or mistakes by the user. The system draws on a diverse set of AI tech- nologies that are linked within a Belief-Desire- Intention (BDI) agent system. Although the sys- tem provides a number of automated functions, the overall framework is highly user centric in its support for human needs, responsiveness to human inputs, and adaptivity to user working style and preferences.