Grace Korean Church (GKC) was established in 1982 by David Kwangshin Kim in Fullerton, California. From the very beginning, Kim led the church into a robust missionary engagement, which is being continued and even intensified by his successor, Paul Kihong Han. Throughout its three-decades of history, the church has invested more than 50% of its total income to supporting and maintaining its mission operations (with more than 250 missionaries in close to 60 countries). This book investigates the theological motivation for GKC's missions: pneumatological missiology, theology of revival, diaspora theology, Reformed theology, Presbyterian theology, and mission theology. The book also shows the extent of the church's mission engagement by continents. Finally, the book turns its attention to the future with an evaluation of the church's missionary journey I recommend this book because Pastor Yang wrote it under the auspice of Oxford Centre for Mission Studies in England as their visiting scholar. The book has enough merits to be trusted from a missiological perspective. The start of GMI's world mission and its entirety are well explained in this book. I hope to see the whole world coming to know more about the world mission of GMI through this book. David Kwangshin Kim President of Grace Ministries International