Dr. BRUNO KOLB is an internationally recognized expert on gas chromatography. Until his retirement in 1996, he managed the GC Applications Laboratory at Perkin-Elmer Corporation, Germany; he has also been involved in instrument development with special emphasis on specific detectors. He has been a guest lecturer at the University of Konstanz, as well as at international meetings. He has published many journal articles and book chapters, and is the author of a textbook on gas chromatography.

Dr. LESLIE S. ETTRE was a senior scientist at Perkin-Elmer Corporation until his retirement in 1990. Between 1988 and 1995 he served as an adjunct professor in the Department of Chemical Engineering at Yale University, and from 1995 until 2004 he continued his association with the school as a research affiliate. In addition to lecturing widely in the field of gas chromatography, Dr. Ettre has published over 200 scientific and technical papers, and is the author and editor of numerous books, including Encyclopedia of Industrial Chemical Analysis. He has received numerous awards, including the National Award in Chromatography of the American Chemical Society and the AJP Martin Award of the Chromatographic Society—the highest honors in the United States and Europe, respectively.