Fr. Diego Buscio was born in Pezzaze (Brescia, Italy) on July 9, 1949. He entered the minor seminary in Desenzano del Garda on September 27, 1959. He was given the religious habit on September 26, 1965 and made his first religious profession in Zagarolo on September 29, 1966.

He took his college and Philosophy at the Mother House in Messina. Later, while residing in the community of Grottaferrata, he attended the theological studies at the Lateran Pontifical University in Rome. He was ordained priest on June 29, 1975, the Holy Year, by Pope Paul VI. Fulfilling his missionary desire, the Superiors assigned him to the first Rogationist mission in the Philippines. He left together with Fr. Vito Di Marzio on December 21, 1976, to join Fr. Antonio Barbangelo who had gone to the Philippines shortly ahead of them.

In the mission in Parang, which was later officially entrusted to him and to Fr. Di Marzio, he celebrated his first Mass in English on January 1, 1977. With a great spirit of adaptation, he immediately started studying the native language, “Tagalog”. By profoundly caring for those simple and good people who were in need of everything, he was able to conquer their hearts. On April 26, 1977, he wrote to Father General, "It seems to me that during our last conversation on the phone, doubts were expressed about the mission of Parang. I have waited for an entire life to have the possibility to come to the mission, and I would never exchange this place for any other part of the world because of these people whom I love and consider as the main purpose of my life.”

The most urging problem in Parang was water. He decided to provide the needed funds and on March 10, 1978, he wrote for this to his mother and to the parish priest of Pezzaze. Those were his last letters. On that very day he died.

On the evening of that day, because of great zeal, he accepted the request to hear confessions and to celebrate the Holy Mass in a nearby village. On his way with others in a car which fetched them, there was a fatal collision with a truck at the crossroad. It was the end. Two actions, one of human promotion and the other of evangelization, sealed that day the missionary dream of Fr. Diego. His remains now rest in the Cemetery of Pezzaze.