Ruma Banerjee, PhD, is the Vincent Massey Collegiate Professor of Biological Chemistry at the University of Michigan, Ann Arbor. She was the founding director of the Nebraska Redox Biology Center. Dr. Banerjee has published over one hundred articles and several book chapters, and edited The Chemistry and Biochemistry of Vitamin B-12 (Wiley). Drs. Becker, Dickman, Gladyshev, and Ragsdale are the Associate Editors and were all members of the Redox Biology Center at the University of Nebraska when this book project began. Drs. Dickman and Ragsdale are currently at Texas A&M and the University of Michigan respectively.