Valery J. Cholakov was trained in biological anthropology at the University of Sofia. Later he worked as a historian of science at the Bulgarian Academy of Sciences. At Northwestern University he did a study on the environmental history of Russia. At present, he is a researcher in the Department of History at the University of Illinois, Urbana. Among his publications are The Nobel Prizes: Men and Discoveries ( Moscow, 1986) and "The Tides of Environmental Discourse", Science Studies 7, no. 1 ( 1994).
J. Donald Hughes is John Evans Professor of History at the University of Denver. He received his Ph.D. from Boston University. He is a founding member of the American Society for Environmental History and former editor-inchief of Environmental Review (now Environmental History). His published books include Pan's Travail:Environmental Problems of the Ancient Greeks and Romans
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Publication information: Book title: The Face of the Earth:Environment and World History. Contributors: J. Donald Hughes - Editor. Publisher: M. E. Sharpe. Place of publication: Armonk, NY. Publication year: 2000. Page number: 189.