Mark and Joanne Landon met in Edinburgh in 1983. Joanne had been serving as a single missionary since 1980, and Mark visited on a summer team as a Bob Jones University student. In 1985, on Joanne's first furlough, they married and returned to Scotland that year.

Mark grew up in western Colorado, and was saved at the age of 20. He went on several mission teams as a college student and graduated from BJU in 1984. Joanne was born in Detroit, Michigan. One of her earliest childhood memories was of her parents entertaining missionaries. She graduated from Bob Jones Academy in 1975 and Bob Jones University in 1979.

The Landons have served in Shetland, Dalkeith and Edinburgh. Their mission work includes church and nursing home services, children and ladies' ministries, visitation, and tract distribution. Their two children, David and Louretta, were born and reared in Scotland.