Nikos Viazis was born in 1965 in Athens, Greece. He graduated from the Medical University of Patras, Greece. He was a Trainee in Gastroenterology at Evangelismos Hospital in Athens, Greece from 1995 to 1999. He completed his post-graduate training in the UK and the US. He has worked as a Registrar and Consultant Gastroenterologist at Evangelismos Hospital since 2000.