St. Gregory the Great Parish was established on August 11, 1959 and the first parish Mass was celebrated in the cafeteria of Peters Elementary School on the Feast of the Assumption, August 15, 1959.

Father Michael Keller (1959 – 1968) was the founding pastor. With the arrival from Philadelphia of three Sisters of the Holy Family of Nazareth, St. Gregory School was opened on September 6, 1960 with an enrollment of 143 students in three portable classrooms donated by the neighboring parish of Our Lady Queen of Martyrs. Rev. Mother M. Romuald (1960-1966) was the first principal. The parish church was dedicated on January 8, 1961. A convent building to house the sisters was completed a few years later.

The classroom buildings adjacent to the parking lot were constructed in 1962 and 1963 with two of these classrooms serving as a temporary parish rectory. The present parish rectory was completed in 1968.

As the school enrollment grew, a block of temporary wooden classrooms was gradually constructed at the southernmost part of the parish property between 1975 and 1980.

On September 14, 1979, the parish church was partially destroyed by fire, resulting in the construction of the present modern parish church which was completed in March 1981 by Fr. Martin Cassidy who was pastor from 1974 to 1991. The former church was then rebuilt and now serves as the Parish Center. In 1987, a school library located between the school buildings and the Parish Center was completed.

In 1988, St. Gregory School was awarded the prestigious “Exemplary School Award” by the United States Department of Education.

The holy Family of Nazareth Sisters relinquished the administration of the parish school in June 1990.

Monsignor Noel Fogarty became pastor in August 1991 and shortly thereafter obtained the services of three Dominican Sisters of Adrian, Michigan, to administer the school and coordinate the ministries of the parish.

At the present time plans are being studied for the provision of modern school facilities to ensure the continuation of quality Catholic education and the refurbishing of the parish buildings for an ever-expanding array of ministries as the parish prepares to meet the needs of the 21st Century Church.