Background
He was born in Edon, Scotland on 21 September 1740, the third son of William and Violet Dempster of Newton, West Lothian.
He was born in Edon, Scotland on 21 September 1740, the third son of William and Violet Dempster of Newton, West Lothian.
He studied at Edinburgh University.
Between 1768 and 1774, John Wesley sent Francis Asbury and seven other Methodist lay preachers to the colonies, Dempster being one of them. lieutenant is thought his arrival would have been in 1774. On the outbreak of the Revolutionary War, Dempster and Asbury chose to remain in America while the others returned to England.
Asbury remained active as a minister, but due to the hostility shown towards British ministers, Dempster elected to withdraw from prominent ministry and settled on a farm in the Mohawk Valley of upstate New York, where he remained for the rest of his life.
John Dempster became a Methodist missionary in Argentina and later founded Boston University School of Theology and Garrett Biblical Institute (now Garrett-Evangelical Theological Seminary) in Evanston, Illinois. James Dempster died in Florida, New York on 10 May 1804.