Sean Ekins, MSc, PHD, DSc, is the Principal at Collaborations in Chemistry; and Adjunct Associate Professor in the Department of Pharmaceutical Sciences at the University of Maryland, School of Pharmacy. Dr. Ekins has published widely on ADME/Tox, systems biology, computational, and in vitro drug discovery approaches. He has previously edited two Wiley books: Computer Applications in Pharmaceutical Research and Development (2006) and Computational Toxicology: Risk Assessment for Pharmaceutical and Environmental Chemicals (2007). Jinghai J. Xu, PHD, is Director of Automated Biotechnology at Merck. Previously he headed predictive toxicology at Pfizer, where he led research activities in drug-induced liver injury, genetic toxicology, drug transporters, assay development, high content screening, in vitro in vivo correlations, systems biology, and systems toxicology. Dr. Xu has served on steering committees of academic-industry and industry-industry collaborations, and as a guest lecturer at the Massachusetts Institute of Technology.