Dr. Barbara Kanki of NASA Ames Research Center for her continued support in risk assessment over the years.

Cherlyn Jewkes and Rachelle Wilhelmsen for their help with editing and formatting.

Dawn Dieckmann for her help with reference checking.

Warren “Dewey” Plaster, John Ostrom, David E. Fry, Rochelle Mason, Val Sealey, Eric Roy, and Louis Valenti for their contributions to the case studies.

Kyle Williams for critical review of the document early in its life.

Laura Ostrom for the chapter titled Risk of an Epidemic.

Also, all the graduate students who provided comments or information over the years.