E. N. Helmers is Consultant Manager of Air Quality and Hazards Engineering in the Engineering Department of the Du Pont Company, Wilmington, Del. He has been with Du Pont for 32 years in environmental consulting and management. He studied meterology at MIT where he obtained a BS in civil engineering and MS in sanitary engineering. He is a registered professional engineer in chemical engineering (Ind.).
Leon C. Schaller
E. I. Du Pont de Nemours & Co., Inc., Wilmington, Del. 19898
L. C. Schaller is Manager, Safety and Fire Protection Section of Du Pont's Safety & Fire Protection Division. He has been with Du Pont for 22 years as a safety survey engineer, consultant and section manager. He graduated from Illiois Institute of Technology with a degree in Fire Protection and Safety Engineering. He is a member of the National Fire Protection Association, Society of Fire Protection Engineers and is a PE in safety in Calif.