AYMAN F. EL-KATTAN, B. Pharm, PhD, is Associate Research Fellow in Pfizer's Pharmacokinetics, Dynamics, and Metabolism Department, Cambridge Laboratories and an Adjunct Professor at College of Pharmacy-University of Rhode Island in Rhode Island, US. Dr. El-Kattan is a reviewer for several journals and is an active member of the American Association of Pharmaceutical Scientists (AAPS). He serves on the executive committee of the Drug Transporter focus group. He has been invited speaker 50 times at national/international conferences and has published over 100 papers in peer-reviewed Journals, book chapters, and proceedings.