1. US Environmental Protection Agency; National Exposure Research Laboratory; Ecological Exposure Research Division; Cincinnati Ohio
2. US Environmental Protection Agency; National Risk Management Research Laboratory; Ground Water and Ecosystems Restoration Division; Ada Oklahoma
3. Ecological Society of America; Washington, DC USA
4. LK Consultancy; Turner Valley Alberta Canada
5. Kenyon College; Department of Biology; Gambier Ohio USA
6. on detail with cooperative status at US Environmental Protection Agency; Western Ecology Division; Corvallis Oregon
7. Quantitative Landscape Ecology; Institute for Environmental Sciences; University Koblenz-Landau; Landau Germany