John was born at Spaniard's Neck, Queen Anne's County, Maryland. His parents were Methodists, his father a jurist who designed him for the law. His mother, however, who had been converted under Garrettson, devoted John at birth to the ministry. His eldest son Robert, born in 1814, became a professor of Latin and Greek at Dickinson College in 1836 and later its president. In 1841 he published a biography of his father, Life of the Rev. John Emory. He was educated by tutors at Easton and Lancaster, Pennsylvania, and in Washington College, Chestertown, Maryland. He experienced "saving grace" at a Quarterly Meeting in 1806. He studied law in 1805 in the office of Judge R.T. Earle, Centreville, Maryland, and was admitted to the bar in 1808. But his attention soon turned to the pulpit, against his father's protests, and he entered the Traveling Ministry of the Philadelphia Annual Conference of the M.E. Church in 1810.
Ministry
Emory became well known, and his services were much in demand throughout the Middle States. He was elected a Member of the General Conference of 1816, and then to each succeeding General Conference through 1832. He was sent as a delegate to the British Wesleyan Conference in 1820. He was appointed Book Agent and Editor for the M.E. Church in 1824, with offices in New York City. While a bishop, he continued his interest in the Book Concern, and during his management thereof was successful in paying-off all its debts, returning it to a solid foundation. He was especially active in promoting the improvement of the literature of the M. E. Church. For example, he founded the "Methodist Quarterly Review," nearly all the original articles in the first two volumes being from his own pen. He was prominent in the founding of the New York University and of Wesleyan University, and was one of the principal organizers of Dickinson College as a Methodist school. He was an able debater. In 1817 in a pamphlet controversy, he used his literary weapons, not unsuccessfully, against Bishop White of the Protestant Episcopal Church. In the controversy of 1828 which led to the founding of the Methodist Protestant Church he was the chief defender of existing M.E. polity. He was of a logical turn of mind, and had command of a pure, clear, and vigorous style. As a Bishop he was largely influential in giving the Methodist Episcopal Book of Discipline its present form.