William J. Bell (1943–1998) was a revered entomologist specializing in insect physiology and behavior. His two-volume work, Chemical Ecology of Insects (coedited with R. T. Carde), is considered a classic in the field. Louis M. Roth (1918–2003) was an acknowledged world expert on cockroaches at Harvard University. Christine A. Nalepa is a research specialist with the North Carolina Department of Agriculture and an adjunct associate professor of entomology at North Carolina State University. She works on a variety of insects, including beetles, wasps, cockroaches, and termites.