DR. GUILLERMO MARTÍNEZ DE TEJADA Guillermo Martínez de Tejada holds a Ph.D. in Biology and works as a Professor in the Department of Microbiology and Parasitology of the University of Navarra. From 1989 to 1994, his doctoral investigations focused on characterizing the molecular basis of Brucella resistance to host-derived cationic antimicrobial peptides and the role of LPS in this phenomenon. From 1994 to 1997, he carried out postdoctoral studies in the University of California at Los Angeles (UCLA), where he investigated at the molecular level the interaction of Bordetella pertussis with its host respiratory tract and the regulation of the pathogen virulence determinants involved in that process. Currently, his research is centered on studying the interaction of antimicrobial peptides with their molecular targets (LPS, lipopeptides, etc…) on the surface of human pathogens, such as Salmonella, Pseudomonas and Staphylococcus. These studies are aimed at developing new strategies to combat antibiotic resistance, biofilm-related infections and to neutralize sepsis and septic shock.