He is certified in the comprehensive practice of industrial hygiene (CIH) by the American Board of Industrial Hygiene. Dr. Cohen is the past chair of the ANSI Z88.2 committee on respiratory protection and a current member of the editorial board of the Journal of Occupational and Environmental Hygiene. He is the past chair of the American Industrial Hygiene Association’s respiratory protection committee, a past president of the Connecticut River Valley Chapter of the American Industrial Hygiene Association, and a past officer and treasurer of the American Board of Industrial Hygiene.

Alan Hack is retired from the Los Alamos National Laboratory (LANL). He is certified in Comprehensive Practice of Industrial Hygiene (CIH) and is a Certified Safety Professional (CSP). He has a Masters in Industrial Safety that he received in 1967 from New York University. He has extensive experience with facial measurements and respirator fit testing. Mr. Hack is currently working as a consultant. He is a member of two committees: the ANSI Committee on Respiratory Protection and the American Industrial Hygiene Association Committee on Respiratory Protection.

Subhash R. Lele is a Professor in the Department of Mathematical and Statistical Sciences at the University of Alberta. He has a Ph.D. in Statistics from Pennsylvania State University. Dr. Lele has expertise in statistical analysis of forms and shapes with applications in medicine, spatial data analysis and its applications in public health, ecology, and environmental sciences.

Youcheng Liu is an Assistant Professor of Medicine at Yale University. He received his M.D. in 1983 from Nanjing Medical University, an M.P.H. in Environmental Health Sciences in 1987 from Peking University School of Public Health, an M.S. in Environmental Health in 1994 and a Sc.D. in Industrial Hygiene in 1997, both from the Harvard School of Public Health. Dr. Liu’s expertise is in exposure assessment and modeling, indoor air sciences, industrial hygiene, and occupational epidemiology, with considerable expertise in respirator fit testing and respirator workplace performance evaluation.

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