Dr. David S. Goodsell is Associate Professor in the Department of Molecular Biology at The Scripps Research Institute, La Jolla, CA, USA. His illustrations have become well known and now appear in many publications as the primary demonstration of the crowded nature of cells. He has also provided expertise and illustrations to many science museums, most recently acting as a "thinking partner" for a new multi-site nanotechnology initiative headed in part by the Exploratorium in San Francisco.