Narottam P. Bansal, PhD, is Senior Research Scientist at the NASA Glenn Research Center, where he has conducted research on glasses, ceramics, and composites since 1985. In addition to publishing more than 230 papers, Dr. Bansal holds seven patents and is the author or editor of five books and 32 conference proceedings.Aldo R. Boccaccini, Dr.-Ing., is Chair and Professor of Biomaterials in the Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Germany. The holder of four patents, Dr. Boccaccini has coauthored more than 400 papers and edited four books and 14 conference proceedings.