Reformed theologian in the context of "Church Dogmatics"

Karl Barth (/bɑːrt, bɑːrθ/; Swiss Standard German: [bart]; (1886-05-10)10 May 1886 – (1968-12-10)10 December 1968) was a Swiss Reformed theologian. Barth is best known for his commentary The Epistle to the Romans, his involvement in the Confessing Church, including his authorship (except for a single phrase) of the Barmen Declaration, and especially his unfinished multi-volume theological summa the Church Dogmatics (published between 1932 and 1967). Barth's influence expanded well beyond the academic realm to mainstream culture, leading him to be featured on the cover of Time on 20 April 1962.

Like many Protestant theologians of his generation, Barth was educated in a liberal theology influenced by Adolf von Harnack, Friedrich Schleiermacher and others. His pastoral career began in the rural Swiss town of Safenwil, where he was known as the "Red Pastor from Safenwil". There he became increasingly disillusioned with the liberal Christianity in which he had been trained. This led him to write the first edition of his The Epistle to the Romans (a.k.a. Romans I), published in 1919, in which he resolved to read the New Testament differently.

John Knox (c. 1514 – 24 November 1572) was a Scottish minister, Reformed theologian, and writer who was a leader of the country's Reformation. He was the founder of the Church of Scotland.

Born in Giffordgate, a street in Haddington, East Lothian, Knox is believed to have been educated at the University of St Andrews and worked as a notary-priest. Influenced by early church reformers such as George Wishart, he joined the movement to reform the Scottish Church. He was caught up in the ecclesiastical and political events that involved the murder of Cardinal David Beaton in 1546 and the intervention of the regent Mary of Guise. He was taken prisoner by French forces the following year and exiled to England on his release in 1549.

Cornelius Van Til (May 3, 1895 – April 17, 1987) was a Dutch-American Reformed theologian, who is credited as being the originator of modern presuppositional apologetics. Van Til and his work heavily influenced Christian reconstructionist theologians like Greg Bahnsen and R.J. Rushdoony.

He graduated from Calvin College and received his PhD from Princeton University, where he taught before co-founding and teaching at Westminster Theological Seminary until his retirement.

Karl Paul Reinhold Niebuhr (June 21, 1892 – June 1, 1971) was an American Reformed theologian, ethicist, commentator on politics and public affairs, and professor at Union Theological Seminary for more than 30 years. Niebuhr was one of America's leading public intellectuals for several decades of the 20th century and received the Presidential Medal of Freedom in 1964. A public theologian, he wrote and spoke frequently about the intersection of religion, politics, and public policy, with his most influential books including Moral Man and Immoral Society and The Nature and Destiny of Man.

Starting as a minister with working-class sympathies in the 1920s and sharing with many other ministers a commitment to pacifism and socialism, his thinking evolved during the 1930s to neo-orthodox realist theology as he developed the philosophical perspective known as Christian realism. He attacked utopianism as ineffectual for dealing with reality. Niebuhr's realism deepened after 1945 and led him to support American efforts to confront Soviet communism around the world. A powerful speaker, he was one of the most influential thinkers of the 1940s and 1950s in public affairs. Niebuhr battled with religious liberals over what he called their naïve views of the contradictions of human nature and the optimism of the Social Gospel, and battled with religious conservatives over what he viewed as their naïve view of scripture and their narrow definition of "true religion". During this time he was viewed by many as the intellectual rival of John Dewey.