Lorenzo Cosmi is the Director of the SODc of Immunoallergology of the AOU Careggi and Full Professor of Internal Medicine at the Department of Experimental and Clinical Medicine of the University of Florence. He received a degree in Medicine and Surgery from the University of Florence in 1995 and completed a specialization in Allergology and Clinical Immunology at the university in 2000. In the 2001/2002 academic year, he joined the teaching staff of the specialization school in Allergology and Clinical Immunology. He served as a research grant holder at the Department of Internal Medicine, Florentine University from 2001 to 2003 and as a Researcher at the Department of Internal Medicine of the University of Florence from 2003 to 2004. Then, he became a permanent researcher in the disciplinary field of MED09 (Internal Medicine) at the Department of Internal Medicine of the University of Florence. He took up service as an Associate Professor of Internal Medicine at the Department of Experimental and Clinical Medicine of the University of Florence in 2014 and obtained the national scientific qualification (ASN) as a full professor (first level) in sector 06B1-Internal Medicine in 2017. He was assigned, by AOU Careggi, the function of temporary replacement and support of the owner of a complex structure (deputy SOD director) in 2018. He spends much of his time researching Immunology, Cell Biology, Interleukin 21, Cytotoxic T cells, and IL-2 receptors.