Walter Hollenweger
Walter Jacob Hollenweger (born 1927 in Antwerp; died 10 August 2016) was a Swiss theologian, recognized as an expert on worldwide Pentecostalism.From 1949-1958, Hollenweger served as the pastor in a Pentecostal Mission, but in 1962 was ordained in the Swiss Reformed Church.He wrote a ten volume doctoral dissertation Handbuch der Pfingstbewegung (Handbook of the Pentecostal Movement) published in 1966.His numerous publications in the years following made him one of the premier interpreters of this movement.[2] Hollenweger, who served as the first Secretary for Evangelism in the Division of World Mission and Evangelism of the World Council of Churches from 1965 to 1971, long continued to be a staunch advocate of ecumenism for Pentecostal churches.