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Hans Jonas

Hans Jonas is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hans Jonas rather than just read about it. In short: Hans Jonas (; German: [ˈjoːnas]; 10 May 1903 – 5 February 1993) was a German and American philosopher. From 1955 to 1976 he was the Alvin Johnson Professor of Philosophy at the New School for Social Research in New York City.

Hans Jonas — main illustration
Hans Jonas — illustration

Key takeaways

  • Hans Jonas belongs to astronomy; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Hans Jonas to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Hans Jonas from memory before moving on to harder problems.

Reference excerpt

Hans Jonas (; German: [ˈjoːnas]; 10 May 1903 – 5 February 1993) was a German and American philosopher. From 1955 to 1976 he was the Alvin Johnson Professor of Philosophy at the New School for Social Research in New York City.

Biography

Jonas was born in Mönchengladbach, on 10 May 1903 to a Jewish family. He studied philosophy and theology at the University of Freiburg, the Friedrich Wilhelm University of Berlin and Heidelberg University, and finally earned his Doctorate of Philosophy in 1928 from Marburg University with a thesis on Gnosticism entitled Der Begriff der Gnosis (The Concept of Gnosis) and directed by Martin Heidegger. During his study years his academic advisors included Edmund Husserl and Rudolf Bultmann. At Marburg University he met Hannah Arendt, who was also pursuing her PhD there, and the two of them were to remain friends for the rest of their lives. When Heidegger joined the Nazi Party in 1933, it may have disturbed Jonas, as he was Jewish and an active Zionist. In 1964 Jonas repudiated his mentor Heidegger for his affiliation with the Nazis. He left Germany for England in 1933, and from England he moved to Palestine in 1934. There he met Lore Weiner, to whom he became betrothed. In 1940 he enlisted in the British Army. He served in the Jewish Brigade and was sent to Italy, and in the last phase of the war moved into Germany. Thus, he kept his promise that he would return only as a soldier in the victorious army. In this time he wrote several letters to Lore about philosophy, in particular philosophy of biology, that would form the basis of his later publications on the subject. They finally married in 1943. Immediately after the war he returned to Mönchengladbach to search for his mother but found that she had been sent to the gas chambers in the Auschwitz concentration camp. Having heard this, he refused to live in Germany again. He returned to Palestine and took part in the 1948 Arab–Israeli War. Jonas taught briefly at the Hebrew University of Jerusalem before moving to North America. In 1950 he left for Canada, teaching at Carleton University. From there he moved in 1955 to New York City, where he was to live for the rest of his life. He was a fellow of the Hastings Center and Professor of Philosophy at New School for Social Research from 1955 to 1976 (where he was Alvin Johnson Professor). From 1982 to 1983, Jonas held the Eric Voegelin Visiting Professorship at LMU Munich. He died at his home in New Rochelle, New York, on 5 February 1993, aged 89.

Philosophical work Jonas's writings were very influential in different spheres. For example, The Gnostic Religion, based on his early research on the gnosis and first published in 1958, was for many years the standard work in English on the subject of Gnosticism. The Imperative of Responsibility (German 1979; English 1984) centers on social and ethical problems created by technology. Jonas insists that human survival depends on our efforts to care for our planet and its future. He formulated a new and distinctive supreme moral imperative: "Act so that the effects of your action are compatible with the permanence of genuine human life". While The Imperative of Responsibility has been credited with catalyzing the environmental movement in Germany, his work The Phenomenon of Life (1966) forms the philosophical undergirding of one major school of bioethics in America. Murray Bookchin and Leon Kass both referred to Hans Jonas's work as major, or primary, inspiration. Heavily influenced by Martin Heidegger but also one of Heidegger's most outspoken philosophical critics, The Phenomenon of Life attempts to synthesize the philosophy of matter with the philosophy of mind, producing a rich existential understanding of biology, which ultimately argues for a simultaneously material and moral human nature. On the question of abortion, Jonas was against it, saying, "a mother-to-be is more than her individual self. She carries a human trust, and we should not make abortion merely a matter of her own private wish", society had a "social responsibility" to pregnant mothers, and "To give this mission [motherhood] over completely to individual choice oversteps the order of nature." His writing on the history of Gnosticism revisits terrain covered by earlier standard works on the subject such as Ernesto Buonaiuti's Lo gnosticismo: storia di antiche lotte religiose (1907), interpreting the religion from a unique version of existentialist philosophical viewpoint that also informed his later contributions. He was one of the first philosophers to concern himself with ethical questions in biological science. Jonas's career is generally divided into three periods defined by his three primary works, but in reverse order: studies of gnosticism, studies of philosophical biology, and ethical studies.

Works Jonas, Hans (1930). Der Begriff der Gnosis: Teildruck (Doctoral thesis).

… excerpt ends here. Continue reading the full article.

Illustrations

Hans Jonas illustration
Hans Jonas illustration
Hans Jonas: Birth house of Hans Jonas in Mönchengladbach
Birth house of Hans Jonas in Mönchengladbach
Hans Jonas: In front of the house, two Stolpersteine were installed in 2008. The left one commemorates the philosopher's mother Rosa Jonas, murdered in Auschwitz in 1942.
In front of the house, two Stolpersteine were installed in 2008. The left one commemorates the philosopher's mother Rosa Jonas, murdered in Auschwitz in 1942.

Worked examples

Example 1 — a first encounter with Hans Jonas

Start with the simplest possible case. Write down what Hans Jonas claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hans Jonas before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hans Jonas ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hans Jonas

In research
Hans Jonas appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Hans Jonas in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Hans Jonas is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1903 births, 1993 deaths, 20th-century American historians, so understanding it makes those chapters shorter.
In everyday life
Look for Hans Jonas outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Hans Jonas in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hans Jonas means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Hans Jonas out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hans Jonas in simple terms?

Hans Jonas (; German: [ˈjoːnas]; 10 May 1903 – 5 February 1993) was a German and American philosopher. From 1955 to 1976 he was the Alvin Johnson Professor of Philosophy at the New School for Social Research in New York City.

Why does Hans Jonas matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hans Jonas?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hans Jonas.

Tags

  • 1903 births
  • 1993 deaths
  • 20th-century American historians
  • 20th-century German male writers
  • 20th-century German philosophers
  • Academic staff of Carleton University
  • American historians of religion
  • Bioethicists
  • Commanders Crosses of the Order of Merit of the Federal Republic of Germany
  • Environmental ethicists
  • Existentialists
  • Fellows of the Hastings Center

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