Roberts University, Synan co-authored with Ralph Rath his ninth book titled Launching the Decade of Evangelization in 1990. It was during this same year he chaired the Holy Spirit Congress in Indianapolis where 25,000 gathered in the Hoosier Dome. Part three of Launching the Decade of Evangelism provided a historical background of the events which led up to the Indianapolis Renewal gathering. After this, there were two more Congresses on the Holy Spirit and World Evangelism—one in Orlando in 1995 and one in St. Louis in 2000. At the Indianapolis Congress in 1990, Demos Shakarian commissioned Synan to write Under His Banner to celebrate the 40th anniversary of the Full Gospel Business Men's Fellowship International which began in 1951. By the time this book was published in 1992, this ecumenical forerunner movement had grown to over 3,000 chapters in 117 nations. His book, The Spirit Said "Grow" was the fourth in a series of books published by MARC Innovations on mission. The material for this book was originally presented as a series of lectures on "Evangelization and the Charismatic Renewal" in 1990 at the Church Growth Lectureship at the School of World Mission, Fuller Theological Seminary under the leadership of C. Peter Wagner. In this sixty-two page book, Synan cites David Barrett's statistics to provide a historical sketch of the explosive growth of Pentecostal-Charismatic Renewal around the world, employing the "Third Wave" analogy first expressed by Wagner in 1983. In a book review by Henry Lederle, Synan's book The Century of the Holy Spirit: 100 Years of Pentecostal and Charismatic Renewal was described as "a lasting contribution to the recording of Pentecostalism," and a book that is "poised to become the standard work of reference for the historical development of the various Pentecostal and Charismatic awakenings of the twentieth century." This book, which Lederle calls Synan's "magnum opus," contains 15 chapters, seven of which were written by Synan and the remaining eight chapters by contributing authors. While the primary focus of the book is the 21st century, it also provides a brief history of the Wesleyan Holiness antecedents which begin in the early 18th century. Written at the invitation of Bert Ghezzi, a Catholic Charismatic and editor of Servant Publications, Voices of Pentecost: Testimonies of Lives Touched by the Holy Spirit is a devotional book, presenting short personal testimonies of 61 individuals throughout history, especially Pentecostals and Charismatics who, as