Karl Barth in the context of "Infinite qualitative distinction"

Friedrich Daniel Ernst Schleiermacher (/ˈʃlaɪərmɑːxər/; German: [ˈfʁiːdʁɪç ˈʃlaɪɐˌmaxɐ]; 21 November 1768 – 12 February 1834) was a German Reformed theologian, philosopher, and biblical scholar known for his attempt to reconcile the criticisms of the Enlightenment with traditional Protestant Christianity. He also became influential in the evolution of higher criticism, and his work forms part of the foundation of the modern field of hermeneutics. Because of his profound effect on subsequent Christian thought, he is often called the "Father of Modern Liberal Theology" and is considered an early leader in liberal Christianity. The neo-orthodoxy movement of the twentieth century, typically (though not without challenge) seen to be spearheaded by Karl Barth, was in many ways an attempt to challenge his influence. As a philosopher he was a leader of German Romanticism.

Oscar Cullmann (25 February 1902, Strasbourg – 16 January 1999, Chamonix) was a French Lutheran theologian. He is best known for his work in the ecumenical movement and was partly responsible for the establishment of dialogue between the Lutheran and Roman Catholic traditions. Because of his intense ecumenical work, Cullmann's Basel colleague Karl Barth joked with him that his tombstone would bear the inscription "advisor to three popes".

In Protestant Christianity, Neo-orthodoxy or Neoorthodoxy, also known as crisis theology and dialectical theology, was a theological movement developed in the aftermath of the First World War. The movement was largely a reaction against doctrines of 19th-century liberal theology, and a reevaluation of the teachings of the Reformation. Karl Barth is the leading figure associated with the movement. In the United States, Reinhold Niebuhr was a leading proponent of neo-orthodoxy. It is unrelated to Eastern Orthodoxy.

The Epistle to the Romans (German: Der Römerbrief) is a commentary by the Swiss theologian Karl Barth on the New Testament Epistle to the Romans.

In the summer of 1916 Barth decided to write a commentary on Paul's Epistle to the Romans as a way of rethinking his theological inheritance. Barth was a pastor in Safenwil at the time. Protestant Liberal theology had played a significant role in the rise of German nationalism prior to World War I. The first edition of the commentary was published in December 1918 (but with a publication date of 1919). It was the first edition of the work, which earned Barth his invitation to teach at the University of Göttingen and which Karl Adam said fell "like a bombshell on the theologians' playground." In October 1920 Barth decided that he needed to revise the first edition and worked for the next eleven months on rewriting the commentary, finishing around September 1921. The second edition was published in 1922 and translated into English in 1933.

Church Dogmatics (German: Kirchliche Dogmatik) is the four-volume theological summa and magnum opus of Swiss Reformed theologian Karl Barth and was published in thirteen books from 1932 to 1967. The fourth volume of the Church Dogmatics (CD) is unfinished, and only a fragment of the final part-volume was published, and the remaining lecture notes were published posthumously. The planned fifth volume was never written.