David J. Hunt, Ph.D. (1974), University of Reading, is an Emeritus Fellow at CABI Europe-UK. He has authored a book and numerous papers on nematode taxonomy and is currently Editor-in-Chief of Nematology and Series Editor for Nematology Monographs and Perspectives. Khuong B. Nguyen, Ph.D. (1988), University of Florida, retired. He has co-edited the volume Entomopathogenic Nematodes: Systematics, Phylogeny and Bacterial Symbiontsa (Brill, 2007), has authored 8 book chapters and about 90 papers in Nematology, especially on taxonomy of entomopathogenic nematodes. Sergei E. Spiridonov, Ph.D. (1986), Moscow State University, is leading researcher in Severtsov’s Institute of Ecology and Evolution, Russia Academy of Sciences, Moscow. Main scientific interests are in taxonomy of parasitic nematodes. Chief Editor of the Russian Journal of Nematology. Sergei A. Subbotin, Ph.D. (1987), Institute of Helminthology, Moscow, Russia, presently at the California Department of Food and Agriculture, USA, with associate positions at Ghent University, Belgium, and the Center of Parasitology, Russia. Publications include 150 articles, and two books.