Derek and Heather Johnston have spent years playing a key role with the Wycliffe Bible Translation Society to convert Burkina Faso tribespeople.
The Johnstons of ChristChurch, Belfast, have dedicated a large portion of their lives to the little-known African country, with Derek guiding the work of several Wycliffe teams to translate the scriptures into a variety of African dialects.
Their work included spending six years in the capital, Ouagadougou, translating the New Testament into Sissala language.
Derek's responsibilities broadened once he completed a Master's in Theology from Queen's University, Belfast, in 2003. Since 2010, he has moved into a wider role of liaising with national Christian organisations involved in Bible translation work in France's other former West African colonies.
One blog from a Christian who was hosted by the Johnstons described how in 10 years Christian denominations had grown from 12 churches to more than 300. John Cousins