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By Alphabetical Order:
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2. ASTRONOMY
Harlow Shapley (1885-1972)
Vesto Slipher (1875-1969)
Edwin Hubble (1889-1953)
Karl Jansky (1905-1950)
Grote Reber
An American ham operator who discovered cosmic radio waves – -of a very long variety (6 feet) – emitted by distant stars within our Milky Way.
3. ELECTROMAGNETIC AND ATOMIC THEORY
Marie and Pierre Curie (Marie: 1867-1934 / Pierre: 1859-1906)
Guglielmo Marconi (1874-1937)
In 1901 Marconi successfully transmitted radio waves across the Atlantic from England to the United States.
J. J. (Joseph John) Thomson (1856-1940)
It was the English scientist J.J. Thomson who gave the first satisfying explanation of the inner structure of the atom – at least to the extent of identifying electrons (which Thompson at the time called "corpuscles"). The scientific world was fascinated with the ability of cathode rays to pass through vacuum tubes – with no means of conveyance for "waves" to pass through. Speculation was that these rays were not waves but were particles. It was Thomson who was able to conclusively demonstrate that indeed cathode rays were actually a flow of minute particles – corpuscles (electrons) – given off by atoms. Thomson noted that these particles were very much alike for a variety of materials – and concluded that these particles were themselves quite uniform – their variance, like atoms in elements, a matter of their number and not not any kind of variety among them.
Ernest Rutherford (1871-1937)
Rutherford's major works or writings:
Radio-activity (1904)
Arthur Holly Compton (1892-1962)
Compton's major works or writings:
Secondary Radiations Produced by X-rays (1922)
X-Rays and Electrons (1926)
X-Rays in Theory and Experiment (with S. K. Allison, 1935)
The Freedom of Man (1935)
Human Meaning of Science (1940)
Enrico Fermi (1901-1954)
4. RELATIVITY Albert Einstein (1879-1955)
Einstein wanted to unify all branches of physics around a cohesive set of simple laws, ones that described physical behavior in all possible settings.
He was initially troubled by the inherent contradictions between the classic understanding of the relativity of the laws of mechanics (Galileo and Newton) and the newer view of the absolute character of the laws of electromagnetism (Maxwell). With his theory of special relativity (1905) he demonstrated mathematically that electromagnetism functions with the same relativity of classic mechanics – because of the elasticity of space and time! This theory seemed counter-intuitive at the time, though experiments over the next quarter of a century gave clear demonstration of the correctness of his theory.
A major difficulty with his theory of special relativity was that it applied only to "special" situations (thus its name), that is, situations where light was being measured by an observer whose momentum was constant. Einstein knew that situations of perfectly constant momentum (unchanging speed and direction) are rare. Normally our movements are in constant flux, accelerating, decelerating, turning, etc. as we encounter varying forces acting externally upon our movements. Einstein thus set out to define a more comprehensive theory of mechanical and electromagnetic physics, one he called general relativity.
In this quest for a general theory of relativity it was the issue of gravity that received his greatest attention. Through a number of mental "games," he came up with the notion that gravity is not really a separate force but merely a result of the structuring of the movement of objects through what he called spacetime. This too was counter-intuitive, in the sense that he was attempting to describe a dimension of physical existence that had no exact parallels in what we humans have ever been able to perceive directly. As an analogy of this strange world of general relativity Einstein pointed to the type of curve that is always described on the surface of a globe when something attempts to move along the globe's surface in a straight line.
Another analogy was a rubber membrane with a heavy iron ball nestled in the center of it--and the effect this would have if we tried to roll a much smaller ball across the membrane and past the iron ball in an attempt to reach the other side of the membrane. Depending on how close the smaller ball came to the larger ball, it might be led around and past the larger ball by the curvature of the membrane around the ball – or if it came too close, the smaller ball might be drawn in a circular path around the larger ball and finally into collision with it. Einstein asserted that there was no gravitational "force" that drew the the smaller ball into the orbit of the larger ball – only the curvature (of spacetime) around the larger ball. Thus gravity was explained as being (sort of) merely a curve in the flow of spacetime – a curve created by the presence of concentrated matter/energy. And thus we could calculate the effect of gravity without having to resort to the notion of gravity itself, thus eliminating an unnecessary concept in physics and thus further simplifying physics.
Thus with general relativity Einstein saw himself moving the discipline of physics closer to a cohesive body of laws, laws uniformly applicable in a variety of different physical settings. By eliminating gravity as a separate concept he had certainly moved physics closer to that goal.
But with the development of the field of quantum mechanics Einstein felt that the move toward conceptual unity was headed in the opposite direction. For the longest time he debated the quantum theorists (Bohr, for instance) – -until he had to admit that their theoretical world worked--though in apparent contradiction to his own world of relativity.
For the rest of his life he tried to close the gap within physics created by the quantum revolution--though seemingly without further success.
Einstein's major works or writings:
Theory of Relativity
"What Is Relativity?" (1919)
The Principle of Relativity (1923)
"The World As I See It" (1949)
Ideas and Opinions(1954)
Georges Lemaître (1894-1966)
A Belgian priest and astronomer/physicist who in 1927 first advanced the "Big Bang" theory of the origins of the universe, based on what he saw as the implications of Einstein's theory of relativity.
5. QUANTUM MECHANICS
Max Planck (1858-1947)
Planck was the German physicist at the University of Berlin (1889-1926) most noted for laying the foundations of quantum physics with his idea of the quantum of small particle action, known as the Planck constant or simply, h. The constant h he developed in his study of black-body radiation--noting that the energy values emited in such radiation were not of a continuous variety or array but instead discontinuous, in the the form of discrete, tiny energy packets: quanta. In other words, Planck demonstrated that the energy given off in radiation did not vary in a continuous spectrum from slight to great, but varied over that spectrum in tiny but quantifiable jumps, which happened to be multiples of h. Thus Planck quantized the energy spectrum.
These quanta of energy (E) were measurable as the product of the frequency of the radiation (
or Greek nu) and Planck's constant h. The resultant energy radiation equation for Planck's constant was thus E=h
.
H was a very small quantity, approximately 6.626 × 10-34 (h actually works out to be not much more than 0!). Nonetheless, it was significant enough that it called into question the assumption held since the time of Newton that the laws of physics were uniformly applicable under all (rather than just select or discrete) circumstances.
Planck's major works or writings:
The Theory of Heat Radiation (1914)
Where Is Science Going?(1932)
The Philosophy of Physics (1936)
Niels Bohr (1885-1962)
Bohr's major works or writings:
Atomic Physics and the Description of Nature (1934)
Atomic Physics and Human Knowledge(1958)
Max Born (1882-1970)
Erwin Schrödinger (1887-1961)
Schrödinger's major works or writings:
What Is Life?
Mind and Matter
My View of the World
Nature and the Greeks
Science and Humanism
Werner Heisenberg (1901-1976)
Theory of Uncertainty: we cannot know something as its exists "in and of itself" – because our very action to observe this thing has a shaping effect on it; it responds to our efforts to observe it – thus making a "neutral" observation impossible.
Heisenberg's major works or writings:
Physics and Philosophy
Physics and Beyond
Philosophical Problems of Quantum Mechanics
Paul Adrien Maurice Dirac (1902-1984)
Dirac's major works or writings:
Quantum Theory of the Electron (1928)
The Principles of Quantum Mechanics (1930)
Wolfgang Pauli (1900-1958)
Linus Carl Pauling (1901-1994)
Pauling broadened the reach of quantum theory by bringing it into the world of molecular chemistry, into the realm of crystals and into the domain of medicine.
6. PHILOSOPHICAL EVALUATIONS OF MODERN SCIENCE
James Hopwood Jeans (1877-1946)
Jean's major works or writings:
Physics and Philosophy (1943)
The Mysterious Universe
Henry Margenau
Margenau's major works or writings:
The Nature of Physical Reality (1950)
The Miracle of Existence
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![]() Always looking for an easier, faster and cheaper way of building these automobiles, in 1913 Ford began the use of the assembly line process. This involved the movement away from custom building of cars to the use of standardized parts and a standardardized assembly process. He also employed the principle of simplifying the production process by also simplifying of the features on the automobile. The basic black Model T was the result. He developed this logic further by eventually coordinating the entire automobile business from the point of acquiring raw materials, to the manufacture of parts, to the assembly of the car, to its final distribution and sales. This permitted him to lower considerably per-unit costs and to pass price reductions on to the purchaser--and thus increase the demand for his product. This brought the automobile within the economic reach of the middle class. And in turn this transformed American society into a highly mobile nation--with the home and community now spread at further distances from the old town and city centers. |
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Julian Huxley (1887-1975)
Religion without Revelation (1959) |
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2. FUNDAMENTALISM
John Gresham Machen (1881-1937)
Machen was New Testament professor at Princeton Seminary. Among the several books he published was Christianity and Liberalism (1923), in which he claimed that Christian Liberalism was not even Christianity, but some other religion. He was distressed that Christian Liberals believed (like Unitarians) that Christ was not a "personal savior" but instead a "personal teacher," setting moral examples which all, Christian and non-Christian, ought to follow. And Liberalism tended to view Christianity as simply one of many ways that led to the Fatherhood of God.
When in 1928 the Presbyterian General Assembly voted to move Princeton from a traditionally conservative theology to a more liberal position, Machen and two other Princeton professors withdrew from the seminary to start a new one in nearby Philadelphia: Westminster Seminary.
In 1935 Machen was suspended from the Presbyterian ministry.
Machen's major works or writings:
Christianity and Liberalism (1923)
Cornelius Van Til (1895-1987)
Van Til was born in the Netherlands, but came to Indiana at age ten with his family in order to farm. He attended Calvin College, Princeton Seminary, received a Ph.D. from Princeton University and became an instructor at Princeton Seminary in 1928 – but the next year joined the newly formed Westminster Theological Seminary as professor of Apologetics after the liberal-conservative split at Princeton.
Van Til's major works or writings:
Why I Believe in God
A Survey of Christian Epistemology (1932)
A Survey of Christian Epistemology
The Defense of the Faith
Introduction to Systematic Theology
Christianity and Barthianism
The New Modernism
The Protestant Doctrine of Scripture (1967)
Christian Theistic Ethics (1971)
A Christian Theory of Knowledge (1972)
Common Grace and the Gospel (1972)
My Credo
3. CHRISTIAN LIBERALISM
The Auburn Affirmation (1924)
signed by 1,274 Presbyterian ministers
Harry Emerson Fosdick (1878-1969)
Liberal preacher Harry Emerson Fosdick presented a sermon at the First Presbyterian Church of New York City entitled "Shall the Fundamentalists Win?"
So incensed was the General Assembly (sort of a Presbyterian Congress) at what it considered an attack on the fundamentals of the faith that it considered removing Fosdick from the pulpit (he was defended by the New York Lawyer, John Foster Dulles, who would serve as America's Secretary of State during the Eisenhower presidency in the 1950s).
But Fosdick instead simply resigned his position (John D. Rockefeller would select Fosdick to pastor the prestigious Riverside Church that he had funded!).
4. EVANGELICALISM
To 20th century evangelicals, God's Word is True – but such truth comes to the believer through the mysterious work of the Spirit and is based on the inner perceptions of personal faith.
Thus evangelicalism is not to be confused with "fundamentalism" which stresses the rational and objective basis of the truth of God's Word in Scripture.
But neither is is evangelicalism aligned with "liberalism" which also (like fundamentalism) tries to base the truth of God's Word on some objective factual basis, a basis which however Liberals recognize as being much reduced in extent from what the fundamentalists believe to be the case--because of the many flaws which text-criticism has revealed as existing within the literature of scripture.
Evengelicalism departs very strongly from both fundamentalism and liberalism, which attempt to found the Christian faith on some sort of objective system of "facts." Faith, not fact, is the truth-foundation for evangelicalism.
Albert Schweitzer (1875-1965)
Schweitzer carried forth Weiss' critique of Biblical criticism, pointing out that Jesus lived entirely to the expectation that the Kingdom of God was immanent and that it is absurd to speculate using modern logic that Jesus was trying to force the event with his death.
He also pointed out the impossibility of extracting a "true" or "historical" Jesus from the scriptural account of the early church – for what was given there was not a "factual" description of Jesus at all, but rather the reflections of the faithful as to the ultimate meaning of Christ.
Schweitzer's major works or writings:
The Mystery of the Kingdom of God (1901)
In the Quest of the Historical Jesus (1906)
G.K. (Gilbert Keith) Chesterton (1874-1936)
Chesterton's major works or writings:
Orthodoxy (1908)
Heretics (1908)
What's Wrong With the World (1910)
The Everlasting Man (1925)
C.S. (Clive Staples) Lewis (1898-1963)
Born in Belfast, Northern Ireland. He is sometimes remembered for his tender romance with an American fan of his, Joy Davidman
Lewis's major works or writings:
The Allegory of Love: A Study in Medieval Tradition (1936 )
The Screwtape Letters (1942)
Beyond Personality: the Christian Idea of God (1944)
The Chronicles of Narnia
Abolition of Man (1947)
Mere Christianity (1952)
Simone Weil (1909-1943)
Weil's major works or writings:
Waiting on God
5. "NEO-ORTHODOXY"
Neo-orthodoxy was a close cousin to evangelicalism – in that it stressed the role of faith as the foundation for the Truth of God. But it tended to look to the broad range and long run of such faith, the faith-witness of countless generations of Christians over the centuries, to give some degree of "objective" character to such truth. Thus to the neo-orthodox, the all-important "faith" that underpins the Christian truth is importantly to be found the collective, historical voice of the church, the living "body of Christ."
Karl Barth (1886-1968)
Barth was a formulator of "neo-orthodoxy": revitalization of the dogmas of traditional Christianity as the key to faith. Scripture, guided by the exegetical traditions of the church, is the surest source of faith – and Divine Truth
He was opposed to an "historic" Jesus – as unproveable and irrelevant He posited instead the Christ of faith, who acts to deepen faith in the heart of the believer.
Barth's major works or writings:
Church Dogmatics
The Humanity of God(1960)
Emil Brunner (1889-1965)
Brunner's major works or writings:
Dogmatics
Truth as Encounter
Reinhold Niebuhr (1893-1971)
A Protestant theologian best known for his study of the task of relating the Christian faith to the reality of modern politics and diplomacy.
He attended Elmhurst College (Illinois), Eden Seminary (St. Louis, Missouri) and Yale University, receiving a Batchelor of Divinity Degree from Yale in 1914. In 1915 he was ordained a pastor in the Evangelical Church and took up a pastorate in Detroit, Michigan, where he remained for the next 13 years. In 1928 he took up a teaching position at Union Theological Seminary in New York City.
During his life's intellectual journey he moved from socialism to a position of political "realism" which acknowledges the human aptitude for both sin and goodness--and therefore the necessity of certain (democratic) political structures to keep human behavior on the right track. But even these political structures needed to be worked with great caution. Ultimately it was the sovereignty of God that all the world needed to look to as the only unfailing source of goodness in life.
Reinhold Niebuhr's major works or writings:
Leaves from the Notebook of a Tamed Cynic (1929)
Moral Man and Immoral Society (1932)
An Interpretation of Christian Ethics (1935)
The Nature and Destiny of Man (2 vols: 1941-1943)
The Children of Light and the Children of Darkness:
A Vindication of Democracy and a Critique of Its Traditional Defence(1944)
Faith and History: A Comparison of Christian and Modern Views of History (1949)
The Irony of American History (1952)
The Self and the Dramas of History (1955)
The Structure of Nations and Empires (1959)![]()
H. Richard Niebuhr (1894-1962)
Protestant theologian teaching at Yale Divinity School (1931-1962). He is known best for his interest in how the Christian faith is mediated through popular culture – and how the church should present the Christian gospel in such a way that it could be clearly understood in the context of modern culture.
He was the younger brother of Reinhold Niebuhr and followed his older brother's footsteps in attending Elmhurst College and Eden Seminary – before travelling east to Yale where he took a Ph.D. in theology. He returned to the mid-West where he taught at Eden Seminary (1919-1922 and 1927-1931) and served as President of Elmhurst College (1924-1927). In 1931 he moved permanently to the East to become a professor of theology and ethics at Yale Divinity School.
H. Richard Niebuhr's major works or writings:
The Social Sources of Denominationalism (1929)
The Kingdom of God in America (1937)
The Meaning of Revelation (1941)
Christ and Culture (1951)
The Purpose of the Church and Its Ministry (1954)
Radical Monotheism and Western Culture (1960)
The Responsible Self (1963).
Faith on Earth: An Inquiry into the Structure of Human Faith (edited by his son, Richard R. Niebuhr, 1989)
Dietrich Bonhoeffer (1906-1945)
Bonhoeffer's major works or writings:
Akt und Sein - Act and Being (1931)
Creation and Fall(1933)
Nachfolge - The Cost of Discipleship (1937)
Gemeinsames Leben - Life Together (1939)
Ethik - Ethics (posthumously: 1949)
Widerstand und Ergebung - Letters and Papers from Prison (posthumously: 1951)
6. CHRISTIAN EXISTENTIALISM
Rudolph Bultmann (1884-1976)
Bultmann's major works or writings:
Theology of the New Testament (2 vols: 1951/1955)
Jesus Christ and Mythology (1958)
Paul Tillich (1886-1966)
Tillich's major works or writings:
The Religious Situation (1926)
The Socialist Decision (1932)
On the Boundary (1936)
The Protestant Era (1948)
The Courage to Be (1952)
Systematic Theology (3 vols: 1951/1957/1963)
7. ROMAN CATHOLICISM
Maurice de Wulf (1867-1947)
Pope Pius X (pope: 1903-1914)
Giuiseppe Melchiore Sarto (1835-1914). He was born in poverty in Northern Italy ... worked hard to get an education, became a priest, and became popular among the common people for his simplicity and affection. He would remain ever-dedicated to the Franciscan idea of poverty being a key part of the dignity of the faithful. Even with his rise in the ranks of the Catholic clergy, he held as much as possible to that principle ... and refused to extend any particular material favors to his family ... who remained pretty much in that same state of poverty during his papacy.
He was an excellent preacher and got the attention of the Church’s higher officials ... was elevated in rank and eventually came to the notice of Leo XIII.
As pope, he was particularly interested in restoring Catholic worship rituals. And he too was a strong supporter of the idea of Mary as holy Mother of the faithful. And he too was a strong Thomist. He also restored the Gregorian Chant ... and emphasized the critical importance of the Eucharistic mass. And he was strongly opposed to theological Modernism ... with its efforts to update our understanding of scripture and Church theology, in order to bring it more in line with the secular-materialist worldview coming into dominance at the time. He viewed such Modernism as pure heresy, and to be opposed on all counts.
He also took a much less diplomatic approach to Europe’s secular states ... even breaking off diplomatic relations with France’s Third Republic (1905). And his tightening of restrictions about religiously-mixed marriages actually succeeded in heightening the religious discord between Protestants and Catholics in Ireland! He did however end the decree prohibiting Italian Catholics from voting. But relations in general with the Italian state did not improve any during his papacy.
Pius X's major works or writings:
Pope Benedict XV (pope: 1914-1922)
Giacomo Paolo Giovanni Battista della Chiesa (1854-1922). From the very outbreak of the Great War (World war One) he declared the Catholic Church to be neutral in this nationalist contest. Indeed, he tried on two occasions (1916 and 1917) to formally mediate the conflict ... but was rejected by both sides of the contest. He undertook to offer humanitarian aid to both soldiers (captured and/or wounded) and hungry civilians.
After the war he was not only able to restore diplomatic relations with France, he worked to improve relations with the Italian state, allowing Catholics to participate in its public offices.
Pius Benedict's major works or writings:
Pope Pius XI (pope: 1922-1939)
But the pope answered Hitler’s accusations that the Church was pro-Communist also issued another encyclical, Divini Redemptoris, also denouncing Communism as anti-religious, citing the persecution of the Church that accompanied the establishment of Communism in Russia.Ambrogio Damiano Achille Ratti (1857-1939). As pope, he confirmed Thomist theology as foundational to Catholicism, emphasizing the role of the Vatican’s own Dominican-administered university - the Pontifical University of Saint Thomas Aquinas - as the Church’s own primary academic institution devoted to teaching Thomist theology and philosophy.
He worked to improve diplomatic relations with Europe’s various states, finally ending the standoff with the Italian government by the signing of the Lateran Treaty of 1929.
But in 1931 he issued another encyclical Non abbioamo bisogno (We Do Not Need), not opposing the Italian state as such ... but very strongly condemning Mussolini’s Fascist political philosophy ... especially in the way that it was directed again the Church and two of its key organizations, Italian Catholic Action and the Italian Catholic Youth Organization.
With respect to similar developments in German he did sign a Reichskonkordat in 1933 with Hitler’s Germany ... in the hopes of softening the persecution just underway against German Catholic clergy and Catholic politicians by the Nazis. But ultimately Hitler paid no attention to the terms of the agreement. Catholics, priests and parishioners, were arrested on wild charges ... solely to shut down all voices in Germany except Hitler’s.
Finally, in 1937, Pius repudiated the Reichskonkordat, issuing a new encyclical, Mit brennender Sorge (with Burning Anxiety) condemning the political-ideological trends that had developed in Germany under the “mad prophet” (Hitler) ... an encyclical secretly distributed (300,000 copies in German) to be read from Germany’s Catholic pulpits on Easter Sunday. Hitler was furious ... and had his Gestapo seize all copies they could get their hands on ... and increased dramatically the oppression of the Catholic Church. Catholic schools were shut down. Catholic youth organizations were ended. But amazingly, Catholics seemed to stand with the pope in this matter ... at least for the present.
Pius XI's major works or writings:
Pope Pius XII (pope: 1939-1958)
Eugenio Maria Guiseppe Giovanni Pacelli (1876-1958). Italian of aristocratic origins (and well-placed family in the church hierarchy) who served as papal representative to various European monarchs, to the newly established Soviet Union ... though most importantly to Weimar Germany. Then as the pope’s Secretary of State (1930) he would be responsible for the Vatican’s foreign policies. He would eventually (1933) be responsible for establishing the Catholic Church’s Reichskonkordat with Germany (protecting the rights of the Catholic Church in an increasingly secular Germany). He would also set up similar treaties with other European nations: Austria (1933), Yugoslavia (1935), and Portugal (1940).
During the war, now serving as pope, he worked to keep the papacy neutral ... pleasing neither side and bringing him much criticism after the war. He was accused of turning a blind eye to the Jewish holocaust. But in fact he had those working under him (Roncalli, for instance) working at the problem. And Pius apparently had links to the German Resistance during the war.
After the war he was a very strong voice in opposition to the persecution and deportation of Catholic priests by the Communist governments in Soviet-controlled East Europe.
He also confirmed the concept of the Immaculate Conception, the sinlessness, and the bodily Assumption (“taking up” to Heaven) of the Virgin Mary in his Munificentissimus Deus in 1950.
Pius XII's major works or writings:
Mystici corporis Christi (1943)
Munificentissimus Deus (1950) the doctrine of the Assumption of Mary
Humani generis(1950)
Jacques Maritain (1882-1973)
Etienne Gilson (1884-1978)
Gilson's major works or writings:
The Christian Philosophy of St. Thomas Aquinas (1961)
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Miles H. Hodges