Paul Yarin developed systems that make visible the past usage of objects and surfaces throughout a physical environment. He designed various devices that record histories of interactions between people and physical objects, and that represent this information visually on multiple, distributed displays. These systems require minimal conscious effort for the entry and retrieval of information, and can be readily integrated with existing structures in a physical environment. Formerly, Yarin studied mechanical engineering and design research, earning a BSE from the University of Pennsylvania and an MSME from Stanford University. He has been employed by Boehringer Medical Labs and by IDEO Product Development, and has consulted on projects for Intel, Ford, and several other companies. He recieved his master's degree with MIT in the spring of 1999.