1. Chemist, Toxicology Section Wisconsin State Laboratory of Hygiene 465 Henry Mall Madison, WI 53706, US.
2. Chemist, Wisconsin State Patrol, US.
3. Director, Wisconsin State Laboratory of Hygiene; Professor of Pathology, University of Wisconsin, US.
4. Forensic Dental Consultant, Wisconsin State Crime Laboratory, US.
5. Clinical Professor, University of Wisconsin School of Medicine, US.
6. Chief, Dental Service, William S. Middleton Memorial Veteran's Hospital, US.