Erik graduated from the Technical University of Berlin as a computer scientist and went on to ETH Zürich to get his Ph.D. in computer networking. He is now working at UC Berkeley’s School of Information, where he is Technical Director of the Information and Service Design Program. His field of interest are Web technologies. He is currently focusing on XML core technologies such as XML Schema and XPath. Another area he is working on is the question of how to integrate geolocation concept into the Web, and how to use these concepts for location-based services and locative media in general.