This paper discusses, in the context of personal learning environments, the need for Personal Knowledge Integrators--PKI's or Knowers. It first illustrates and establishes the need for Knowers with usage scenarios and people's requirements. It then describes the elements required to make a Knower which can exchange information with other Knowers, regardless of different platforms or technologies. Knowers will provide a person with a knowledge hub synchronising with learning management systems, personal learning environments, file systems and other sources and sinks of information. A design science approach is described with iterative cycles of design and prototyping.