Klaus Willeke, Ph. D., was trained in Aeronautics and Astronautics at Stanford University and has been a Professor of Environmental Health at the University of Cincinnati since 1981. He has authored or co-authored over 100 journal publications on the physical and biological aspects of aerosol generation, sampling and analysis. Several of the concepts generated in his Aerosol Research and Exposure Assessment Laboratory have been incorporated into commercially available instruments. He is a consultant to major US companies and has lectured widely in America, Europe and Asia. About 30 scientists from other institutions have spent a year or more with him and his international team of researchers.

Paul A. Baron, Ph.D., is a Physical Scientist at the National Institute for Occupational Safety and Health, Physical Sciences and Engineering Division. Currently a member of the Board of Directors of the American Association for Aerosol Research and Associated Editor of the Aerosol Science and Technology Journal, Dr. Baron has authored or co-authored over 60 publications involving fiber measurement or other aspects of aerosol science. The Outstanding Aerosol Paper Award from the Aerosol Technology Committee of the American Industrial Hygiene Association was awarded to Dr. Baron in 1990 and 1993 and to Dr. Willeke in 1993 in 1993; they received the award jointly in 1992.