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 history, the church has invested more than 50 percent of its total income in supporting and maintaining its mission operations (with more than 250 missionaries in close to sixty 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 attention to the future with an evaluation of the church's missionary journey