An MBA holder, Kien Yiak worked as a banker with a foreign bank in Kuala Lumpur for some years before he joined the staff at AYA & ACTS Church. He manages the finance department of ACTS Church and is also serving with the missions board. One of the pioneers of ACTS Church, Kien Yiak also oversees UFO, the campus movement of ACTS Church. He is loved for his humorous and personal approach in engaging with the campus students.