George Robertson is a Senior Researcher in the Visualization and Interaction group at Microsoft Research. He is an ACM Fellow and manages a project on 3D User Interfaces and Information Visualization. Before coming to Microsoft, he was a Principal Scientist at Xerox PARC, working primarily on 3D interactive animation interfaces for intelligent information access applications. He was the architect of the Information Visualizer. He has also been a Senior Scientist at Thinking Machines, a Senior Scientist at Bolt Beranek and Newman, and a faculty member of the Computer Science Department at Carnegie-Mellon University. In the past, he has made significant contributions to machine learning (genetic Classifier Systems), multimedia message systems (Diamond), hypertext systems (ZOG), operating systems (Accent), and programming languages (L*).