Guillermo Alberto Keller is a Professor of Pharmacology (Universidad de Buenos Aires, Facultad de Medicina), Head of the Emergency Department (Hospital Santojanni, Buenos Aires, Argentina), and Director of Centro de Vigilancia y Seguridad de Medicamentos (Drug Safety and Surveillance Center, Universidad de Buenos Aires). He completed his PhD at the Universidad de Buenos Aires. He has published 42 papers in various journals and serves as a reviewer for editorial boards and scientific societies. His teaching disciplines include Emergency Medicine, Clinical Pharmacology, and Drug Safety, and his research interests include emergency overcrowding, disaster management, and clinical pharmacology.