He was awarded a Doctor of Divinity from Hobart in 1888, the General Seminary in 1902 and the University of the South in 1914.

[3] Mann was ordained deacon in 1873 and became deacon-in-charge at St Luke's Church in Branchport, New York.

During that time, on November 11, 1876, he was ordained priest by Bishop Arthur Cleveland Coxe of Western New York.

[5] That same year, he became rector of Grace Church in Kansas City, Missouri, and remained there through 1901.

[6] Mann was elected Missionary Bishop of North Dakota on October 2, 1901, during a General Convention held in San Francisco.