Susan and her husband, Dave, were born and raised in Cornwall and Toronto, Ontario, respectively. They joined Wycliffe in 1985 and began working in West Asia two years later. They spent their first three years in a translation project, then six years in administration (Dave was field director while Susan was finance officer, then group librarian). From 1999 to 2002, they helped establish a training institute that continues to equip nationals for Bible translation work. In September 2002 the Jefferys moved to Chiang Mai, Thailand where Dave taught in a Christian university and served in administration and Susan served in various capacities at the SIL office.
In July 2006 the Jefferys moved to Abbotsford, B.C. and joined the staff of the Canada Institute of Linguistics (CanIL), Wycliffe Canada’s linguistics training facility on the Trinity Western University campus in Langley. For many years Dave was VP for Academic Affairs and course head for two courses. He passed away on March 26th, 2021. Susan continues to manage CanIL’s linguistics library and considers herself privileged to still be helping train the next generation of Bible translators and literacy workers.