Prof. Maria Cristina Fossi is Full Professor of ecology and ecotoxicology in Siena University (Italy) and is Scientific Director since 2000 of the Biomarker Laboratory (CIBM). She gave a key contribution to the development of the biomarker approach in terrestrial and marine ecotoxicology particularly in the field of microplastic pollution. In 2012 she provided the first evidence worldwide on the effects of microplastics on Mediterranean cetaceans. She is author or co-author of over 560 original papers (articles, review articles, chapters and books). She is/has been coordinator of 30 national and International research projects. She is involved in several international scientific organizations (e.g. Past-president of SETAC Italian Branch) and Editorial activities (e.g. Environmental Pollution, Frontiers). She is involved in intense scientific communication and dissemination activity (media, magazines, web, film) about the ecotoxicological effects of contaminants in the Mediterranean fauna and in particular on the effects of plastics in endangered species.