Elected bishop of the Missionary District of Oklahoma and Indian Territory on January 6, 1893, Brooke arrived in Guthrie on January 19 and established Trinity Church as his cathedral church until 1908, when he moved the diocesan headquarters to Oklahoma City.

An Illinois native, who served the church in Minnesota, Thurston was consecrated bishop of Eastern Oklahoma at Minneapolis in 1911.

The Convocation of the church in May 1919, after the death of Brooke, voted to recombine the two districts, and Thurston moved to Oklahoma City and St. Paul's.

His father Simon Casady, a banker, had hoped he would follow him in the banking business, but Thomas developed a vocation for Holy Orders.

Under his care, the diocese opened many new missions all over Oklahoma, including the panhandle as well as St Crispin's, a new conference center in Seminole.

[2][3] Following the retirement of Powell, Gerald Nicholas McAllister became Bishop in 1977 and remained so until 1989 when Robert M. Moody was elected.

At the end of McAllister's time as bishop, the diocese was more financially sound and had grown to 80 congregations, missions, parishes, and two conference centers.

Robert Moody was elected as the bishop coadjutor on September 19, 1987, at St. Paul's Cathedral on the first ballot.

Moody and the diocesan staff assisted in the evacuation of residents from a housing development across from the diocesan offices, provided pastoral assistance in a nearby hospital, and in the days following the blast the distribution of over $500,000 to those in financial need as a result of the bombing.

The former rector of St. Matthew's Episcopal Church in Grand Junction, Colorado, Ed Konieczny was elected on the first ballot on May 5, 2007, at St. Paul's Cathedral.

He earned an associate of arts degree in administration of justice from Long Beach City College; a bachelor's degree in criminal justice from Cal State Fullerton; his Master of Divinity from Church Divinity School of the Pacific; and a Doctor of Ministry from Seabury-Western Theological Seminary.

At the time of his election he was rector of All Saints’ Episcopal Church and Day School in Phoenix, Arizona.

He was consecrated on May 30, 2020 at St. Paul's Cathedral in Oklahoma City, and seated on August 8, 2020, the feast of St. Dominic.