Prof. Dr. Marcos Vannier-Santos is a distinguished biomedical researcher at Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil, with internationally recognized contributions to parasitology, drug repositioning, and infectious disease biology. With 99 peer-reviewed publications, over 5,000 citations, and an h-index of 34, his work has significantly advanced understanding of host–parasite interactions, mechanisms of cell death in protozoan infections, and innovative therapeutic strategies for neglected tropical diseases such as Chagas disease and leishmaniasis. His recent studies include photodynamic approaches, repositioned drug candidates, and combination therapies that address toxicity and drug resistance. Prof. Vannier-Santos collaborates widely, reflected in an extensive global co-author network, and integrates interdisciplinary approaches linking basic science, translational research, and community-based One Health initiatives, demonstrating meaningful societal impact in endemic regions