Dreyer, Willem Akkerhuys (Wim)2017-11-032017-11-032017-06-30Dreyer, W.A., 2017, ‘There is only one Church! Albert Geyser’s ecclesiology in Delayed Action’, HTS Teologiese Studies/ Theological Studies 73(1), 4598. https://DOI.org/ 10.4102/hts.v73i1.4598.0259-9422 (print)2072-8050 (online)10.4102/hts.v73i1.4598http://hdl.handle.net/2263/63012This was delivered during the third A.S. Geyser Commemorative Lecture by the author on 30 March 2017 at the University of Pretoria as part of the centenary celebrations of the Faculty of Theology.A.S. (Albert) Geyser was professor of New Testament at the University of Pretoria from 1946 to 1961, when he accepted an appointment at the University of the Witwatersrand. He was one of the most active and outspoken critics of apartheid and played a leading role in the establishment of the Christian Institute and the appointment of Beyers Naude as the first director of the Institute. However, Geyser received very little attention either in church history or in the history of South Africa. This contribution, presented as the Third A.S. Geyser Commemorative Lecture at the University of Pretoria, reflects on Geyser’s ecclesiology. It is quite remarkable that Geyser chose ecclesiology as point of entry into the discourse on apartheid. He engaged in fundamental theological criticism of segregation in church and state based on his understanding of the unity of the church in Christ and a humanity unified under the kingship of Christ.en© 2017. The Authors. Licensee: AOSIS. This work is licensed under the Creative Commons Attribution License.Geyser’s ecclesiologyChristApartheidEcclesiologyEcumenical ecclesiologyKarl BarthGeyser, Albert StephanusArticle