Founded in 1910 by immigrants from the Russian and Austro-Hungarian empires, the Cathedral was the spiritual and cultural haven of those facing the risks, challenges and opportunities of the American experience.

Like other parishes in North America, Holy Trinity Cathedral has evolved from an ethnic community to one that opens its doors to all seeking the life in Christ.  Presently over 50% of the adult membership is comprised of converts who, to a large extent, were drawn to Orthodox Christianity through the Cathedral's rich liturgical cycle.

It is corporate prayer that forms the core of parish life.  It is corporate prayer which has provided the most vibrant venue for evangelical outreach in the urban environment.  Consequently, every facet of Cathedral life stems from its commitment to coming together as a community of prayer.  Through this commitment the parish strives to reveal and proclaim the Gospel of new and eternal life.  From its liturgical content, culminating in the celebration of the Divine Liturgy, the Cathedral continuously seeks to draw others into its living experience of God's inaugurated and transfigured kingdom.  It is this reality, founded on and centered in Jesus Christ, that compels the Cathedral parish to identify itself as a community of prayer and also as a community of learning.

Because learning is fundamental to Christian formation, church school and adult education are perceived by the parish as vital complements to liturgical worship.  Church school convenes on Saturdays before the Vigil service.  Dedicated teachers and parents have made the Cathedral school one of the most unique in the diocese.  Due to the integration of church school and Vigil, the students have the opportunity to experience the interrelationship of learning and worship.  Adult education meets on Sundays during the coffee hour, while the Rector's Seminar is held on a weekday before Vespers.  The Seminar is comprised of Orthodox and non-Orthodox Christians and focuses on reading and discussing patristic and modern theological texts.

To further serve the local community, the Cathedral established the St. Herman's food pantry.  The pantry is a humble expression of love for the many poor who, with very little, eke out an existence in a city with an ever increasing high cost of living index.