Letizia Marsili is an Associate Professor of Siena University, and she is in charge of the “Residue Analysis” and “Cell Cultures” laboratories. Currently, her main nominations include Scientific Manager for the marine part of the Tuscan Observatory of Biodiversity (OTB) of the Tuscan Region, Director of the Inter-University Centre for the Study of Cetaceans (CIRCE), and Delegate of the Rector for Student Citizenship. She is currently teaching Nature Conservation, Ecology, and Monitoring Techniques of Marine and Terrestrial Environments. She has published several manuscripts, both on the development and the validation of non-lethal sampling tools, and on the application of biomarkers of exposure and effects for environmental contaminants in the study of marine mammals. From SCOPUS evaluation, her h-index is 33. She is actively involved in communication on ecotoxicological topics concerning the effects of contaminants on marine fauna. She has participated and is the coordinator of many national and international projects.