Edward K. Wagner (May 4, 1940 – January 21, 2006) was Professor of Molecular Biology and Biochemistry at the University of California Irvine. Martinez J. Hewlett is Professor Emeritus in the Department of Molecular and Cellular Biology at the University of Arizona. New to this edition, David C. Bloom is Associate Professor in the Department of Molecular Genetics and Microbiology at University of Florida and David Camerini is Assistant Professor in the Department of Molecular Biology and Biochemistry at the University of California Irvine.