denomination. Two revisions of the book were published in 1986 and 1998 respectively. In 1972 Synan was invited by Kilian McDonnell to speak at the third annual Catholic Charismatic Conference at University of Notre Dame. This was a life changing experience that marked the beginning of many years of leadership in the ecumenical movement. Because of Synan's involvement in the Charismatic movement, in 1974 he wrote Charismatic Bridges which is an overview of the history of the Pentecostal movement and served as an introduction to those outside the Pentecostal tradition. The Holiness-Pentecostal Movement in the United States published by Eerdsmans in 1971 was a result of Synan's PhD dissertation. It was later revised and published under the title Holiness-Pentecostal Tradition in 1997. His central thesis was that Pentecostalism was rooted in the Holiness movement in the late 19th century. While this is a commonly held belief by many Pentecostal historians today, it was a fresh concept at that time. Prior to publishing his monograph, Synan added three chapters beyond his dissertation to include the Catholic Charismatic Movement which was at this time in full swing. Synan was concerned that including the Catholic's in his book would jeopardize his standing in the Pentecostal world since his position validated the Catholic Renewal as a genuinely Pentecostal experience. To his surprise, more Catholics purchased the book than any other group as they attempted to discover the history behind their charismatic experience. Copies were sent to the Vatican and all over Europe, and as a result, Synan became a frequent speaker at Catholic Charismatic events and was invited to participate in the Catholic-Pentecostal dialogue with David du Plessis and Kilian McDonnell. After thirty-seven years The Holiness-Pentecostal Tradition, revised in 1997 under its present title, is still a popular text. Synan's book Aspects of Pentecostal-Charismatic Origins which he edited in 1975 is a compilation of articles presented at the Society for Pentecostal Studies in 1973. The book offers a variety of themes related to the history of the Pentecostal-Charismatic movement. While serving as the Director of Evangelism for the Pentecostal Holiness Church, he published his seventh book In the Latter Days: The Outpouring of the Holy Spirit in the Twentieth Century in 1984. Originally written in 1974 as a series of lectures presented for the King Memorial Lectureship at Emmanuel College, Synan used the motif first described by David Wesley Myland in his book The