Guilherme Macedo is the Head of the Gastroenterology Department at the Hospital São Joao (HSJ) and the University of Porto Medical School (FMUP), Portugal. He received his medical degree from the University of Porto in 1983, and also earned a PhD conducting research on cytokines and liver diseases. He is a Guest Editor of the Diagnostics journal and a Co-Guest Editor of the Medicina journal for MDPI. His research interests mainly include gastroenterology; hepatology; liver transplantation; hepatocellular carcinoma; gastrointestinal diseases; biliary tract diseases; and inflammatory bowel diseases. His scientific output includes 388 publications, corresponding to 3648 citations (h-index 27) (Scopus, 17 November 2023).