A special edition of the Journal of Pharmaceutical Sciences was recently dedicated to Professor Gordon Amidon. The edition honors his many contributions to the pharmaceutical sciences, particularly in oral drug absorption. Gordon Amidon, PhD, Charles R. Walgreen Jr. Professor of Pharmacy and Pharmaceutical Sciences, is best known for his establishment of the Biopharmaceutics Classification System (BCS), which is currently in use by the U.S. Food and Drug Administration, as well as internationally, for classification and regulation of pharmaceuticals.