Michael Ellenbecker, Emeritus Professor of Occupational and Environmental Hygiene and Director of the Toxics Use Reduction Institute at the University of Massachusetts Lowell, has published widely on the measurement and control of airborne contaminants.  He is co-author of the Wiley textbook Ventilation for Control of the Work Environment, 2d edition.  For the past ten years he has led the nanoparticle health and safety efforts at UMass Lowell.  Candace Tsai, Assistant Professor of Occupational Health and Industrial Hygiene at Purdue University, and previously Manager for EHS research at UMass Lowell, has led groundbreaking research in exposure assessment and engineering controls associated with nanotechnology development.  She received her doctorate in occupational and environmental hygiene and cleaner production at UMass Lowell.  Dr. Tsai also has Master’s degrees in chemical engineering and management science of business administration.  Dr. Tsai has evaluated the potential for nanoparticle exposure in laboratories at many universities and  private companies, and developed control techniques and strategies to eliminate exposure in more than a dozen of them.