Latter Rain Covenant and Pentecostal Power in which the Pentecostal outpouring around the start of the 20th century was recognized as the fulfillment of the Joel 2 prophecy for early and latter rain. In this book, Synan depicts the antecedents of the Pentecostal outpouring of the 20th century as the "Gathering Clouds." The chapter on the early history with Charles Parham and the Azusa Street Revival the author titles "The Rain Falls in America." The chapter "The Rain Falls Around the World" is a description of the movement's growth into Europe, Chile, Latin America, Russia, and Brazil. The two chapters "The Rain Rejected" and "The Rain Reconsidered" discusses the troubled years when Pentecostalism came under harsh criticism and then with the rise of the healing Evangelists and the Charismatic movement which began with Dennis Bennett, a more positive attitude evolved. The history of the Catholic Charismatic Renewal and the Jesus People was described as "Rain Fall" and "Cloudburst." The book closed with the three streams of Renewal coming together into one "River". He gives this opening statement in the book: "There is only one outpouring of the Holy Spirit in the latter days, although the streams flow through channels known as 'classical Pentecostalism,' Protestant 'neo-Pentecostalism,' and the 'Catholic charismatic renewal.' In the end, it adds up to one great historical phenomenon which has had a profound effect on Christianity around the world." According to Synan, In the Latter Days has been published in more languages than any of his other books. In 1985, Synan was the founder and chairman of the North American Renewal Service Committee which resulted in the New Orleans Leaders Conference that hosted over 7,500 leaders from Pentecostal denominations and mainline churches involved in the renewal movement. In 1987, 40,000 people attended the following General Congress hosted in the New Orleans Superdome. In preparation for the conference, Synan had the opportunity to interview many of the pioneer leaders of the various charismatic renewal groups and obtain a firsthand account of their story. These conversations led him to realize there was "a great deal that remain[ed] to be told about this movement." The results of his findings were published in 1987 under the title The Twentieth-Century Pentecostal Explosion: The Exciting Growth of Pentecostal Churches and Charismatic Renewal Movements. While serving as the Director of the Holy Spirit Research Center and Professor of Pentecostal and Charismatic History at Oral