Ivan S. Tjahja returned to Indonesia in 2004 after his study in Musicians Institute, Hollywood, CA; majoring in Percussions. Since then, he is continually serving through his passion, especially for young people to be saved. And after GOD called him personally to dedicate his life in a ministry in 2012, he started to learn Biblical Hebrew intensively in Hebrew University of Jerusalem, and Hebraic Context of The Bible in Israel Institute of Biblical Studies; while serving as the Head of Pastoral and leading Pastoral Ministry Teams in Mt. Zion Church, Surabaya.

After the passing of late Ps. Lokky S. Tjahja as Mt. Zion Church’s Senior Pastor and Founder in July 2022, Ps. Ivan S. Tjahja, is now stepping up to continue the divine legacy through the leadership in the church as Senior Pastor; while his wife, Vania D. Tjahja is currently taking the leadership in a Christian private school under the wing of Mt. Zion Church, as a School Director; that has been entrusted with more than 300 students from Preschool to Senior High School.