**Birthdate:**March 14, 1879

**Sun Sign:**Pisces

**Birthplace:**Ulm, Germany

**Died:**April 18, 1955

Find out more about the greatest 19th Century German Scientists, including Albert Einstein, Max Planck, Alfred Wegener, Robert Koch and David Hilbert.

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1

Albert Einstein

(One of the Greatest Physicists of All Time, Best Known for Developing the Theory of Relativity)

Deemed as the most influential physicist of the 20th century, the German-born physicist Albert Einstein was one of the greatest minds to have ever lived. Even his name is now synonymous with the term genius. The father of Modern Physics is credited with developing the theory of relativity and explaining the photoelectric effect. The latter won him the Nobel Prize.

2

Carl F. Gauss

(One of the Greatest Mathematicians of All Tim)

German mathematician and physicist Carl Friedrich Gauss is remembered for his work in math and science. Known as the *Princeps mathematicorum*, he laid down tenets such as the *Gauss's Law*. He had exhibited his talent since an early age and had completed writing *Disquisitiones Arithmeticae* by 21.

3

Max Planck

(German Theoretical Physicist and Originator of 'Quantum Theory')

German theoretical physicist Max Planck is remembered for originating the *quantum theory of physics*, which earned him the 1918 **Nobel Prize in Physics**. He laid down concepts such as the *Planck constant* and the *Planck postulate*. The **Kaiser Wilhelm Society** was later renamed **Max Planck Society **in his honor.

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4

Wilhelm Rontgen

(German Mechanical Engineer and Winner of the 1901 Nobel Prize in Physics)

Wilhelm Rontgen was a German physicist and mechanical engineer. He is best remembered for producing and detecting X-rays for which he was honored with the first Nobel Prize in Physics* *in 1901. His discovery of X-rays remains one of the greatest achievements in the field of medical science.

5

Fritz Haber

(Chemist)

Fritz Haber was a German chemist who was honored with the prestigious **Nobel Prize in Chemistry** for inventing the Haber-Bosch process. The process is used widely to synthesize ammonia from hydrogen gas and nitrogen gas. For his pioneering work in weaponizing poisonous gases like chlorine during World War I, Haber is referred to as the **father of chemical warfare**.

6

David Hilbert

(Mathematician)

German mathematician David Hilbert was first drawn to math inspired by his mother, who was a budding math enthusiast. He contributed to a host of concepts, theories, and postulates, such as *Hilbert space*, *Hilbert's program*, and *Hilbert's problems*. He died in oblivion, with a handful of people at his funeral.

7

Georg Cantor

(Mathematician)

Georg Cantor is remembered as the man behind the set theory of mathematics. Not known to many, he was a skilled violinist, too. He was one of the first to explore infinity. His final years were riddled with mental ailments, when he believed Shakespeare’s plays were written by Francis Bacon.

8

Heinrich Hertz

(German Physicist Who Discovered the Existence of Electromagnetic Waves)

Heinrich Hertz was a German physicist best remembered for proving the existence of electromagnetic waves with conclusive evidence. For his contributions, Hertz has been honored around the world by a number of countries, including Japan, Russia, and Germany. In 1930, the *International Electrotechnical Commission* established hertz (Hz) as the SI unit for frequency.

9

William Herschel

(Astronomer Known for His Discovery of 'Uranus' and 'Infrared Radiation')

William Herschel was a German-born British astronomer and composer. He pioneered the use of astronomical spectrophotometry and discovered infrared radiation. Impressed by his work, King George III appointed him the Court Astronomer. Herschel often collaborated with his sister, Caroline Lucretia Herschel, a fellow astronomer. In 1816, he was made a Knight of the Royal Guelphic Order.

10

Bernhard Riemann

(Mathematician)

Bernhard Riemann was a German mathematician best remembered for his contributions to number theory, analysis, and differential geometry. His paper on the prime-counting function, which was published in 1859, is considered one of the most influential papers in the history of analytic number theory. Riemann is widely regarded as one of the greatest mathematicians ever.

11

Georg Ohm

(Physicist & Mathematician)

Georg Ohm was a German mathematician and physicist. He is credited with discovering the proportionality between the voltage applied through a conductor and the subsequent electric current, which came to be known as ** Ohm's law**. His work earned him the prestigious

12

Otto Hahn

(Chemist)

13

Hermann von Helmholtz

(Physicist and Physician)

A descendant of Pennsylvania founder William Penn through his mother, Hermann von Helmholtz studied medicine, pushed by his father, in spite of being interested in the natural sciences. Best known for his law of conservation of energy, he coalesced the fields of medicine, physiology, math, and physics in his studies.

14

Theodor Schwann

(Physiologist)

Theodor Schwann was a German physiologist and physician best remembered for his important contributions to biology. He is credited with discovering the Schwann cells, which is named after him. He is also credited with discovering pepsin and the organic nature of yeast. Theodor Schwann also invented the term *metabolism*.

15

Gustav Kirchhoff

(Physicist)

Gustav Kirchhoff was a German physicist who is credited with coining the term *black-body radiation*. He is best remembered for his contribution to the basic understanding of spectroscopy, electrical circuits, and the emanation of black-body radiation. In 1862, he received the prestigious *Rumford Medal.* The *Bunsen-Kirchhoff Award* is named after Gustav Kirchhoff and German chemist Robert Bunsen.

16

Gottlob Frege

(Philosopher)

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17

Carl Gustav Jacob Jacobi

(German Mathematician Who Founded the Theory of Elliptic Functions)

Carl Gustav Jacob Jacobi was a German mathematician best remembered for his contributions to differential equations, dynamics, number theory, determinants, and elliptic functions. He is the first Jewish mathematician to work as a professor at a German university. Jacobi has a crater on the Moon named after him in recognition of his contribution to science.

18

Robert Bunsen

(Chemist)

Chemist Robert Bunsen paved the path for spectrum analysis with his discovery that every element emits a light of a particular wavelength. He also co-developed and lent his name to the *Bunsen burner*. He almost died of arsenic poisoning and lost sight in his right eye in a laboratory explosion.

19

Robert Koch

(Physician)

Robert Koch was a German microbiologist and physician. One of the prominent co-founders of modern bacteriology, Koch is credited with creating and improving laboratory techniques and technologies in the field of microbiology. He is also credited with making important discoveries in public health. In 1905, Robert Koch won the *Nobel Prize in Physiology or Medicine *for his research on tuberculosis.

20

Justus von Liebig

(German Chemist Who is Considered One of the Principal Founders of Organic Chemistry)

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German chemist Justus von Liebig is best known for his research on organic compounds and his contribution to biochemistry and agriculture. The **Copley Medal**-winning scientist initially studied pharmacy but later switched to chemistry. As a professor, he stressed on laboratory-based teaching of chemistry and separating it from pharmacy, opposing traditional methods.

21

Karl Weierstrass

(Mathematician)

Karl Weierstrass was a German mathematician best remembered for his significant contributions to mathematics. Often referred to as the *father of modern analysis,* Weierstrass proved the *Bolzano-Weierstrass theorem* and the *intermediate value theorem*. He also authorized the definition of* continuous function*. The asteroid *14100 Weierstrass* and the lunar crater *Weierstrass *are named after him.

22

Alfred Wegener

(German Climatologist and Geophysicist Known for His 'Continental Drift Theory')

In the early 1900s, meteorologist Alfred Wegener did not find too many takers for his theory that all the continents of the world had initially been a single mass named *Pangaea* and that continental drift had caused them to split apart. Wegener died on his fourth expedition in Greenland.

23

August Kekulé

(German Organic Chemist Known for His Theory of Chemical Structure and the Tetravalence of Carbon)

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August Kekulé was a German organic chemist. Regarded as one of the most important chemists in Europe, Kekulé is credited with founding the theory of chemical structure, including the Kekulé structure of benzene. Kekulé is also credited with teaching future **Nobel Prize** winners, Jacobus Henricus van 't Hoff Jr., Hermann Emil Louis Fischer, and Johann Friedrich Wilhelm Adolf von Baeyer.

24

Lise Meitner

(Austrian-Swedish Physicist Who Discovered the Element Protactinium)

Lise Meitner was an Austrian-Swedish physicist best remembered for her contributions that led to the discoveries of nuclear fission and the element protactinium. Nicknamed the **German Marie Curie*** *by Albert Einstein, Lise Meitner became the second woman in the world to receive a doctorate in physics in 1905. In 1997, chemical element *109 meitnerium* was named in her honor.

25

Rudolf Virchow

(The Father of Modern Pathology' & the Founder of 'Social Medicine')

Rudolf Virchow was a German physician, pathologist, anthropologist, biologist, prehistorian, editor, writer, and politician. Nicknamed the *Pope of medicine* by his colleagues, Virchow is credited with founding the field of social medicine. He is also widely regarded as the **father of modern pathology .** Rudolf Virchow was the first person to name diseases, such as thrombosis, leukemia, ochronosis, embolism, and chordoma.

26

Ernst Haeckel

(Zoologist & Evolutionist Who Was a Strong Proponent of 'Darwinism')

Ernst Haeckel had initially practiced medicine before he gained an interest in Charles Darwin’s theory and began exploring zoology and related fields. He not only coined terms such as *ecology*, but also named numerous species and created a genealogical tree. He drew numerous figures of animals and sea creatures, too.

27

Paul Ehrlich

(Scientist)

German scientist Paul Ehrlich is remembered for his contribution to immunology, which also won him a **Nobel Prize**. Known as the pioneer of chemotherapy, he also discovered the first-known treatment of syphilis. Born into a business family, he was introduced to the method of studying cells by his pathologist uncle.

28

Wilhelm Wundt

(Philosopher)

Wilhelm Wundt was a German physiologist, professor, and philosopher. He is often counted among the founders of modern psychology and is widely considered the **father of experimental psychology**. He is also credited with founding the first laboratory for psychological research, which he founded at the *University of Leipzig *in 1879.

29

Edmund Husserl

(German Philosopher, Mathematician and Founder of Phenomenology)

Edmund Husserl was a German philosopher of Moravian origin. He established the school of phenomenology. He studied mathematics, physics, and astronomy at the University of Leipzig and worked as an assistant to mathematician Karl Weierstrass. He later became a professor of philosophy and taught for several years. He is considered a major figure in 20th-century philosophy.

30

Wilhelm Ostwald

(Chemist)

Wilhelm Ostwald was a Baltic German philosopher and chemist who is credited with co-founding the field of physical chemistry. A polymath, Ostwald made significant contributions to philosophy, art, and politics, especially after his retirement from academic life. His contributions to the fields of reaction velocities, chemical equilibria, and catalysis earned him the 1909 *Nobel Prize in Chemistry.*

31

Hermann Minkowski

(German Mathematician and Professor Who Created and Developed the Geometry of Numbers)

Hermann Minkowski was a mathematician who served as a professor at the *University of Göttingen*, the *University of Königsberg*, and the *University of Zurich*. He is credited with creating and developing the geometry of numbers. He is also credited with using geometrical methods to resolve problems in the theory of relativity, mathematical physics, and number theory.

32

Friedrich Bessel

(German Astronomer, Mathematician, Physicist, and Geodesist)

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Friedrich Bessel was a German mathematician, astronomer, geodesist, and physicist. He was the first astronomer to use the method of parallax in order to determine the distance of a star from the sun. Bessel was a much-respected figure during his time. He was honored with the *Gold Medal of the Royal Astronomical Society.*

33

Arnold Sommerfeld

(Physicist)

German physicist Arnold Sommerfeld initially taught math and theoretical physics and later came to be known for his groundbreaking work on atomic and quantum physics and wave mechanics. He also laid down the *magnetic quantum number*. Many of the doctoral and post-doctoral students he supervised later won the **Nobel Prize**.

34

Karl Schwarzschild

(Physicist, Astronomer, Astrophysicist, University teacher, Mathematician)

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Karl Schwarzschild was a German astronomer and physicist. He is remembered for his contributions to the general theory of relativity; Schwarzschild came up with the first exact solution to the Albert Einstein field equations. He also contributed immensely to the theory of black holes.

35

Johann Friedrich Blumenbach

(German Physician & Naturalist Considered to be a Main Founder of 'Zoology' and 'Anthropology' as Comparative, Scientific Disciplines)

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A pioneer of physical anthropology, Johann Friedrich Blumenbach laid down one of the first racial classification systems for humans after studying human skulls, dividing mankind into five racial groups. Born into a family of academics, he was a prodigy. He was against scientific racism, though his theory promoted the degenerative hypothesis.

36

Johannes Stark

(Nobel Prize Winner in Physics)

Johannes Stark was a German physicist who discovered the phenomenon that came to be known as the Stark effect. For this work, he was awarded the Nobel Prize in Physics in 1919. A supporter of Adolf Hitler, he was a main figure in the anti-Semitic Deutsche Physik movement. He was found guilty by a denazification court in 1947.

37

Matthias Jakob Schleiden

(German Botanist & Co-founder of 'Cell Theory')

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Matthias Jakob Schleiden was a German botanist who is credited with co-founding cell theory along with Rudolf Virchow and Theodor Schwann. He is also remembered for his service as a professor at the* University of Dorpat* from the mid 1860s.

38

Philipp Lenard

(Physicist)

Philipp Lenard was a German physicist whose work on cathode rays earned him the 1905 Nobel Prize for Physics. He is credited with making certain discoveries that led to the understanding of the* ***Photoelectric*** *effect. An ardent supporter of the Nazi ideology, Philipp Lenard was regarded as a role model for the* Aryan Physics* movement in Nazi Germany.

39

Peter Gustav Lejeune Dirichlet

(German Mathematician Who Made Valuable Contributions to Number Theory, Analysis and Mechanics)

German mathematician Peter Gustav Lejeune Dirichlet is remembered for his invaluable contribution to *number theory*. He pioneered the concept of a* function*, expressed through the equation *y = f (x)*. Though his parents wanted him to become a merchant, his mastery of math made them change their minds.

40

Richard Dedekind

(German Mathematician Known for His Important Contributions to Number Theory, Abstract Algebra and Modern Set Theory)

German mathematician Richard Dedekind is best remembered for his ideas on the real number and infinity. Initially interested in subjects such as physics and chemistry, he later deviated to math. He taught at various institutes and was awarded honorary doctorates from universities of Zurich, Oslo, and Braunschweig.

41

Clara Immerwahr

(German Chemist)

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Clara Immerwahr was a German chemist who became the first German woman to receive a doctorate in chemistry. Apart from being a chemist, Clara Immerwahr was also a pacifist and a women's rights activist. Her work, marriage with the popular chemist Fritz Haber, and her suicide at the age of 44 have inspired films, novels, and TV series.

42

Wilhelm Wien

(Nobel Laureate in Physics)

Wilhelm Wien was a German physicist famous for deducing what became known as Wien's displacement law. He is also credited with formulating an expression for the black-body radiation He was awarded the Nobel Prize in Physics in 1911 for his work on heat radiation.

43

Friedlieb Ferdinand Runge

(German Analytical Chemist)

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Friedlieb Ferdinand Runge was a German analytical chemist best remembered for identifying caffeine. He is also credited with identifying the mydriatic effects of belladonna extract and discovering the first coal tar dye. Friedlieb Ferdinand Runge was also the first person to observe the phenomenon of Liesegang rings in 1855.

44

Hermann Staudinger

(Chemist)

Hermann Staudinger was a German organic chemist whose demonstration of the existence of polymers earned him the prestigious *Nobel Prize in Chemistry* in 1953. He also played a key role in the development of pyrethroid insecticides as he was able to explain clearly the molecular structures of pyrethrin I and pyrethrin II. Hermann Staudinger is also credited with discovering ketenes.

45

Rudolf Clausius

(Physicist, University teacher, Mathematician, Theoretical physicist)

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Rudolf Clausius was a German mathematician and physicist. He is credited with formulating the second law of thermodynamics; he is widely regarded as one of the principal founders of the science of thermodynamics. He taught physics at the *Artillery and Engineering School *in Berlin.

46

Johann Gottfried Galle

(Astronomer, University teacher)

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Johann Gottfried Galle was a German astronomer who worked at the *Berlin Observatory*. On 23 September 1846, he became the first person to view and recognize the planet Neptune. The discovery of Neptune is considered one of the most significant moments of 19th-century science and is widely regarded as a validation of celestial mechanics.

47

Felix Christian Klein

(Mathematician)

Felix Christian Klein was a German mathematician and educator remembered for his work on complex analysis, group theory, and non-Euclidean geometry. He is also popular for his work on the relationship between group theory and geometry. He is credited with teaching advanced courses to students like Gregorio Ricci-Curbastro, who went on to become a renowned mathematician in his own right.

48

Eugen Goldstein

(Physicist)

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49

Carl Bosch

(Chemist & Engineer)

Carl Bosch was a German engineer and chemist. He is credited with founding* IG Farben*, which went on to become one of the largest chemical companies in the world. He is also credited with developing the *Haber–Bosch process*, which is used even today for the production of ammonia. Carl Bosch was awarded the *Nobel Prize in Chemistry* in 1931.

50

Charles Proteus Steinmetz

(German Mathematician and Engineer Whose Research on AC Systems Revolutionized the US Electric Industry)

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Though German-born American mathematician and engineer Charles Proteus Steinmetz suffered from a deformed back since childhood, he excelled in math, physics, and classical literature. His ideas on alternating current (AC) systems initiated the electrical era in the US. By the time he died, he had over 200 patents under his name.