Dr. Francisco J. Márquez is currently a Full Professor of Zoology in the Department of Animal Biology, Plant Biology and Ecology at the University of Jaén, Spain. He obtained his PhD in Sciences (Biology) from the University of Granada in 1989, where his research focused on vector-borne diseases and wildlife reservoirs. Over the past three decades, his professional experience has centered on the ecological, epidemiological, and microbial network dynamics of hard ticks, fleas, and lice, with a particular interest in the core microbiome architecture of several tick and flea species and its implications for pathogen transmission under the One Health framework. Dr. Márquez frequently serves as an expert referee for international peer-reviewed journals in microbial ecology and veterinary sciences. Key words: ticks; flea; lice; pathogens; microbiome; One Health