Professor Tessari is Full Professor of Applied Medical Technical Sciences, with particular expertise in protein metabolism, diabetes and molecular biology. In his lengthy career, Professor Tessari has made contributions to a wide variety of fields, including the regulation of energy substrates, protein and amino acid metabolism in humans, the anabolic effects of substrates and hormones in physiological conditions, and the study of alterations of protein metabolism in pathological conditions, such as type 1 and 2 diabetes, endocrinopathies, cirrhosis of the liver, kidney disease. He has also studied the kinetics of amino acids at the organ level and the effects of metabolic acidosis, including the kinetics of amino acids and compounds involved in vascular disease both in type 2 diabetes, as well as in aging, hypertension, and hypercholesterolemia.

In more recent years, he has worked intensively with proteomics and gene expression studies in cutaneous fibroblasts for patients with type 1 diabetes, and in relation to the presence of renal microvascular complications. He is the author of more than 140 publications in peer-reviewed international journals.