Prof. Marotta is one of the world's leading researchers on probiotics and human health. After his graduation from Catania University with MD (cum Laude) in 1981, he joined University of Chicago as a visiting fellow in gastroenterology. Two years later he was selected by South African Education Ministry to serve as registrar at the University of Cape-Town, Groote Schuur Hospital. He is the first Italian to obtain a PhD from the University of Hirosaki, Japan with entire curriculum in Japanese. He later received a Fellowship from the Japanese Science & Technology Ministry to continue his studies at the National Cancer Center in Tokyo.
Upon returning to Italy, he was appointed as chief consultant in Gastroenterology at S. Anna Hospital, Como, Italy and then as Consultant at Hepato-GI Unit, S. Giuseppe Hosp., Milano, Italy. He is also Consulting Professor at WHO-affiliated Center for Biotechnology and Traditional Medicine, Dept. of Anatomy, University of Milano, Consulting Professor of BioGerontology, Urology Dept., University of Pavia and Visiting Professor at many Japanese Institutions.
He also acts as international consultant to several Asian and middle-eastern gastroenterological societies, and has chaired several international gastroenterology, bioscience and aging meetings. He has received over 20 national and international awards for research papers and lectures at distinguished universities. He is the leading author of several papers, over 350 scientific communications and lectures and many book sections dealing with experimental and clinical gastroenterology, oxidative stress and aging.