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Completed residencies in Otorhinolaryngology at the University of Rome "La Sapienza" in 1984 (Summa cum Laude) and in Audiological Medicine at the University of Naples in 1989.
He graduated from the Pontifical Lateran University and the University of Naples, and then entered the Roman Curia in the Congregation for the Causes of Saints in 1969.
After the high school studies in Nicastro and Monteleone, two centers rich with humanistic culture, he studied Jurisprudence at the University of Naples, but he interrupted his studies and he did not obtain a degree.
Graduated from the University of Naples with a "laurea" in history (1901) and again from the University of Rome in philosophy (1906), Carabellese taught philosophy in Palermo, Sicily (1922–1929) and in Rome (1929–1948), marrying in 1936.
Ruggiero entered the foreign service following a degree in law from the University of Naples.
During this period, he also built the Castel del Monte, and in 1224, he founded the University of Naples, now called, after him, Università Federico II.
Lectures frequently includes prominent international professors such as Prof. David Throsby, Prof. Allen Scott, Prof. Massimo Marelli (rector of University of Naples), Prof. Gianmaria Ajani (dean of the Law Faculty of the University of Turin) and Prof Helmut Anheier.