[3] He was born in Edinburgh the son of William B. Johnston, a civil servant, and his wife, Isabel W.
He was the Minister at Bo’ness from 1949 to 1954; Greenock from 1955 to 1964; and Colinton Parish Church from 1964 to 1991.
A frequent religious broadcaster he was a regular contributor to "Good Morning Scotland".
[5] In 1975 he represented Scotland at the Assembly of the World Council of Churches in Nairobi.
[6] His year as Moderator included a trip to Jerusalem to mark the 50th anniversary of the building of the Scottish church there.