Patrick Johnstone is British and served God with the Dorothea Mission in Southern Africa for sixteen years as a missionary evangelist, discipler, and Bible translator. In Africa, he began compiling information to help people in Africa pray for the world. He then compiled six editions of Operation World between 1965 and 2001, with millions of copies distributed worldwide in nineteen languages. He and his first wife, Jill, were invited to serve for one year on the OM ship MV Logos and thereafter with WEC International as part of the leadership team in the UK, developing strategies to plant churches among the least reached peoples. Just before Jill's death in 1992, she completed a children's version of Operation World, titled You Can Change the World (now Window on the World), which was published in over twenty languages. Patrick has also served part-time leadership roles in the Lausanne and the AD2000 and Beyond Movements. He retired from active leadership roles in WEC in 2015 and lives with his US wife, Robyn, in Derby, England, while retaining his great passion for world evangelization and continuing to encourage and mentor mission leaders. He can be contacted by email at patrick@operationworld.org.