In Spring 1964 a group of Orthodox Christians met with Fr John Nehrebecki, Dean of the New Jersey Deanery, to discuss organization of an English-speaking parish in rapidly growing Morris County. From that moment things moved quickly. Metropolitan Leonty gave his blessing for the group to organize. A place for holy services was found (First Memorial Presbyterian Church in Dover which would be home to the parish for almost 4 years.), the parish was incorporated, Fr Michael Karas assigned as first rector, and in October that year the first Divine Liturgy was celebrated. The community continued to grow and develop with parish council, church school, choir, and St Ann's Altar Guild becoming integral groups within the parish.

In Fall of 1965 a home and nearly five acres of land was purchased in Randolph Township and by year-end, Fr George Hasenecz was assigned rector continuing in that capacity today. The community planned construction of a church building and in August 1967, Metropolitan Ireney conducted groundbreaking ceremonies. Church construction began in November and building was completed one year later. The first Liturgy was celebrated on November 10, 1968 after a late Autumn snowfall. In October 1969, Metropolitan Ireney, Archbishop Kiprian of Pennsylvania and New Jersey Deanery clergy participated in the consecration of the Altar and blessing of the church.

In 1975, to meet needs of the pastor's growing family, the congregation decided to construct a rectory, and, after selling the old rectory and small parcel of land, the new rectory was built. Time passes quickly and soon our unique and beautiful edifice was filled with all neccesary ecclesiastical appointments. Holy Trinity took its place among older established parishes of the diocese. As the community expanded so did organizations and senior and junior FROC chapters were formed. In October 1987, final mortgage payments was made and in January 1988, the first service was held in what was to become Holy Spirit Mission of Sussex County, an outgrowth of Holy Trinity.

With further growth and maturity the parish expanded its ministry to include an outreach program whereby assistance could be offered to those in need. Collecting non-perishable foods is an ongoing year-round project. While the parish has always had an excellent church school program, recently an in-home weekday adult discussion group was formed in addition to the Sunday Adult Group. Holy Trinity's sister parish is the Church of All Saints in Akademgorodok, Novosibirsk and recent contact was made through an individual who visited there. Exchange of photos, videos, and letters has taken place. We look forward to a special and rewarding experience with our fellow Orthodox Christians.

December 1991 saw the parish facing the monumental task of replacing the church roof and in spite of obstacles this project has been successfully completed. Another renovation project which started in the summer of 1997 is the construction of a new entrance to the church building to eliminate the front stairs and make the buiding accessable to all people. This project was completed in the fall of 1997.

Through the efforts of the choir and the generosity of parishioners, four bells were purchased, with the largest being blessed on Palm Sunday. The three remaining bells are expected in the fall of 1998. All the bells were forged in the Netherlands for Rostov Bells of Framingham, MA. Each bell is decorated with an icon.

The parish choir, under the direction of Carol Wetmore, is in the process of making a compact disc of liturgical music. CDs and tapes are available by calling the church office and leaving the necessary info.

Some of the recent events happening in our parish are as follows: In 2001, the cupola and cross were installed over the new entrance. The following year, the mural of "Our Lady of the Sign" was installed on the wall of the Sanctuary. On April 6, 2003, His Beatitude, Metropolitan HERMAN visited the parish and bestowed the Order of St Innocent on Fr George Hasenecz on the occasions of his 40th anniversary to the Priesthood and 38 years as Rector of Holy Trinity Church.

In 2004, the parish celebrated its 40th Anniversary.

In the spring of 2005, a mural depicting the Psalmist King Davidm St Roman the Melodist, St Cassiane and St John of Damascus was installed on the choir wall.

December 18, 2005 will mark the 40th anniversary of the pastorate of Archpriest George P. Hasenecz.