He studied divinity at the University of Edinburgh, graduating with an MA in 1719, while his father was Principal of the University.[4] He was licensed by the Edinburgh Presbytery of the Church of Scotland in 1726 and was ordained at St Cuthbert's Church, Edinburgh in parallel to Rev Neil McVicar who ran the collegiate function of the church. Wishart took over at his father's church at the Tron in 1730. He became Principal Clerk to the General Assembly in 1746 and was elected Moderator in 1748. His service at the Tron Kirk was continuous from 1730 until death – 55 years; the longest-serving minister in that church.[5]
In 1759 Edinburgh University awarded him an honorary Doctor of Divinity (DD). He was appointed Dean of the Chapel Royal in 1765.[5]
Their daughter Jane ("Jeanie") Wishart (1742–1811) married Baron von Westphalen and was grandmother of Jenny von Westphalen, later the wife of Karl Marx), four other daughters, and one son.
Their daughter Janet married Major General John Beckwith.
Publications
A pamphlet seeking Justice to be brought on the murderers of Cpt John Porteous (1737)