Steve Shirley grew up in the Leeward Islands as the son of missionaries Lloyd and Nancy Shirley. After graduating from Bible college, he returned to the Leeward Islands to serve a two-year AIM appointment with his wife, Kari. The Shirleys were appointed as career missionaries in October 1988. They began their first term working in the Leeward Islands and Puerto Rico. In 1991 the Global Missions Board appointed Shirley as superintendent of the United Pentecostal Church of the Dominican Republic. His duties as superintendent include: supervising the works, leadership training, administrating and teaching in the Bible schools, and overseeing construction of new churches. In 1999 the supervision of the Leeward Islands was added to his responsibility. Their three daughters, Kaylin, Kristen, and Megan, are second generation MKs and are an important part of their ministry.