1. Director of research, New England Institute for Life Sciences, 125 Second Ave. Waltham, MA 02254, US.
2. Manager and technical manager respectively, Analytical Services Laboratory, Thermo Electron Corp., Waltham, MA, US.
3. Chemist, FBI Laboratory, Washington, DC, US.
4. Research chemist, Research Division, Chemical Research and Development Center, Aberdeen Proving Ground, MD, US.