Karl Barth
Besides the "Studies in Dogmatics" (see below), Berkouwer is known for his two books on Roman Catholicism – "Conflict with Rome" (1948) and, after the Second Vatican Council in 1962, "The Second Vatican Council and the New Catholicism" – and two books on the work of Swiss theologian Karl Barth – "Karl Barth" (1954) and "The Triumph of Grace in the Theology of Karl Barth" (1954). Though this book was quite critical of Barth's thinking at points, Barth considered Berkouwer to be among the few of his reviewers who actually understood him. All of these books were translated into English, and the last was widely read in the English-speaking world.