Archbishop Owen Farrell McGregor is the Senior Pastor of Mount Calvary Pentecostal Church. He was ordained pastor in 1978 and was elected the Senior Pastor of the National Pentecostal Church in 1985 after the passing of his father. Mount Calvary Pentecostal Church is home to about 7000 members. The church has twenty-five branches, with the main branch in the heart of the communities of Berea, Yeoville, and Hillbrow.

He is a shepherd amongst the people, a leader in the society and endeared by the people of this community. His passion for lost souls has led him to minister in many parts of Sub-Saharan Africa, Asia, Europe, and the USA. The Apartheid government of South Africa could not stop him from preaching in the black townships in the 70's and 80'. He remembers his first encounter with teargas on June 16, 1976, during a crusade that had been held in Soweto that day. He is the Presiding President of the Apostolic Network of Ministers and the Presiding Archbishop of the All Africa Bishop Council.

On 31st March 2018, Bishop Owen Farrell McGregor was elevated to the position of Archbishop. The Presiding Archbishop was Russell McClanahan, assisted by Archbishop Sterling Lands II, and Archbishop Henry Roberts of the Evangelical Episcopal Communion.