Vernon E. Rose is a Professor Emeritus in the School of Public Health at the University of Alabama at Birmingham. During 11 years at NIOSH prior to his tenure at UAB, Dr. Rose directed the Criteria Documentation and Standards Development program and helped OSHA develop industrial hygiene programs. Dr. Rose has served as Editor-in-Chief of the Applied Industrial Hygiene journal (now Applied Occupational and Environmental Hygiene), Secretary-Treasurer of the American Conference of Governmental Industrial Hygienists, Chairman of the American Board of Industrial Hygiene, and is a Past President of the American Industrial Hygiene Association (AIHA) and the International Occupational Hygiene Association (IOHA). Barbara Cohrssen is President of Cohrssen Environmental, Inc. and is a Certified Industrial Hygienist and Registered Environmental Assessor. She co-edited the 5th Edition of Patty's Toxicology and is a recognized authority in the field of industrial hygiene. She has over 30 years of experience in occupational and environmental health and safety. In addition, Ms. Cohrssen is a member of the American Industrial Hygiene Association (AIHA), American Conference of Governmental Industrial Hygienists (ACGIH), and American Academy of Industrial Hygiene (newsletter editor since 1994).