Dr. Grasso specialized in Gastroenterology and Digestive Endoscopy in 1982 and worked for 20 years as a Senior-Assistant in the Department of Gastroenterology of San Carlo Borromeo Hospital in Milan.
In the winter of 1994 he worked as research-fellow in the Meath Hospital Gastroenterology Department in Dublin.
From 2002 to 2015 he was Chief of the Operative Unit of Gastroenterology and Digestive Endoscopy of the C.Ondoli Hospital in Angera, near Varese.
During his professional career he has also acquired extensive of experience in the treatment of liver disease.
In his more than 30 years of practice, he has performed more than 45000 digestive endoscopies of the upper intestinal tract, colon and biliary tract.
He is currently a member of the Italian Group for the Study of Inflammatory Bowel Disease (IG-IBD), a pathology to which he has devoted much study, as reflected in several clinical publications.