20th Century Scientists

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The 20th century was a very vibrant period for the scientific fraternity. With improved technologies available for scientific enquiries, several significant inventions and discoveries happened in the 20th century. Enrico Fermi, credited with discovering how to create a nuclear chain reaction, which led directly the creation of the atomic bomb, was born at the dawn of the century as was Nikolaas 'Niko' Tinbergen, Dutch biologist and ornithologist. Clinton Richard Dawkins, an English ethologist, evolutionary biologist and author, is among the scientists who were born in the mid-20th century. Information technology is one field that emerged in this century and revolutionized the world of communication and technology. Alan Turing, a pioneering English computer scientist, mathematician, logician, cryptanalyst and theoretical biologist played a pivotal role in the development of theoretical computer science. The inventor of the World Wide Web, Sir Timothy John Berners-Lee, is another one of the major scientists of the 20th century. Lawrence Krauss and Carl Sagan are among the other influential scientists born in this era. Read on to learn more about the life and works of famous scientists of the 20th century.
Vote for Your Favourite 20th Century Scientists
 1 
Albert Einstein
(One of the Greatest Physicists of All Time, Best Known for Developing the Theory of Relativity)
Albert Einstein
67
Birthdate: March 14, 1879
Sun Sign: Pisces
Birthplace: Ulm, Germany
Died: April 18, 1955
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 
Stephen Hawking
(Theoretical Physicist - First to Set Out a Theory of Cosmology)
Stephen Hawking
77
Birthdate: January 8, 1942
Sun Sign: Capricorn
Birthplace: Oxford, England
Died: March 14, 2018

Stephen Hawking was an English theoretical physicist and cosmologist, who despite being afflicted motor neurone disease that severely limited his physical abilities, was able to build a phenomenally successful career. He was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. Hawking was ranked 25 in the BBC's poll of the 100 Greatest Britons, in 2002.

 3 
Alan Turing
(Father of Theoretical Computer Science and Artificial Intelligence)
Alan Turing
119
Birthdate: June 23, 1912
Sun Sign: Cancer
Birthplace: Maida Vale, London, England
Died: June 7, 1954

Regarded as the father of computer science and artificial intelligence, Alan Turing was a distinguished mathematician and logician. During WWII, he successfully broke the challenging German Enigma machine codes thereby reducing the duration of war by a couple of years. The scientist, who was convicted for being gay, has been an inspiration for numerous films, plays and novels.

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 4 
Marie Curie
(The First Woman to Win a Nobel Prize)
Marie Curie
39
Birthdate: November 7, 1867
Sun Sign: Scorpio
Birthplace: Warsaw, Poland
Died: July 4, 1934
Amongst the most notable scientists of her time, the first woman to win a Nobel Prize, the sole person to win two Nobel Prize in two different category, and the first woman professor at the University of Paris—Marie Curie’s list of achievements is incredible. She did extensive research in the field of radioactivity and discovered polonium and radium.
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 5 
Srinivasa Ramanujan
(Mathematician)
Srinivasa Ramanujan
67
Birthdate: December 22, 1887
Sun Sign: Capricorn
Birthplace: Erode
Died: April 26, 1920

A self-taught genius Indian mathematician, Srinivasa Ramanujan is known for his contributions to mathematical analysis, number theory and continued fractions. Born into a humble family, the celebrated mathematician struggled with poverty but still managed to publish first of his papers in the Journal of the Indian Mathematical Society. Later, his collaboration with English mathematician G. H. Hardy proved very productive.

 6 
Neil deGrasse Tyson
(American Astrophysicist, Planetary Scientist and Science Communicator)
Neil deGrasse Tyson
52
Birthdate: October 5, 1958
Sun Sign: Libra
Birthplace: Manhattan, New York, United States

Public Welfare Medal-winning astrophysicist and academic Neil deGrasse Tyson hosted shows such as NOVA ScienceNow, Cosmos: A Spacetime Odyssey, and Star Talk. He is the director of Hayden Planetarium and contributed to the dismissal of Pluto’s status as the ninth planet. He has also written a monthly column as "Merlin.”

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 7 
Carl Sagan
(Astronomer and Planetary Scientist Best Known for His Scientific Contribution in Research on Extraterrestrial Life)
Carl Sagan
35
Birthdate: November 9, 1934
Sun Sign: Scorpio
Birthplace: Brooklyn, New York, United States
Died: December 20, 1996
Pulitzer- and Emmy-winning astrophysicist and author Carl Sagan was best known for co-writing the TV series Cosmos: A Personal Voyage. His novel Contact was adapted into a film. He was known for his extensive research on extra-terrestrial life, had taught at major universities, and written countless papers and science books.
 8 
Steve Wozniak
(Co-Founder of Apple Inc.)
Steve Wozniak
13
Birthdate: August 11, 1950
Sun Sign: Leo
Birthplace: San Jose, California, United States

Widely recognized as one of the two important pioneers of the personal computer revolution, Steve Wozniak is credited with co-founding Apple Inc. along with Steve Jobs. Not surprisingly, he has been described as one of the men that changed the course of history through technology. Apart from being a programmer and technology entrepreneur, Steve Wozniak is also a well-known philanthropist.

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 9 
Richard Feynman
(One of the Joint Winners of Nobel Prize in Physics in 1965)
Richard Feynman
26
Birthdate: May 11, 1918
Sun Sign: Taurus
Birthplace: New York, New York, United States
Died: February 15, 1988

Theoretical physicist Richard Feynman won the Nobel Prize in Physics in 1965, along with Julian Schwinger and Shin'ichirō Tomonaga, for his research on quantum electrodynamics. He also contributed to the development of the atomic bomb. Feyman made it to Physics World’s list of the 10 greatest physicists of all time.

 10 
George Washington Carver
(Agricultural scientist)
George Washington Carver
34
Birthdate: 1864
Sun Sign: Capricorn
Birthplace: Diamond, Missouri, United States
Died: January 5, 1943
Agricultural scientist George Washington Carver is best remembered for promoting crops that were alternative to cotton, such as peanuts and sweet potatoes. He invented ways to prevent soil depletion and developed scores of products made from peanuts, including paints and cosmetics. He won numerous honors, such as the Spingarn Medal.
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 11 
John Forbes Nash Jr.
(Mathematician)
John Forbes Nash Jr.
23
Birthdate: June 13, 1928
Sun Sign: Gemini
Birthplace: Bluefield, West Virginia, United States
Died: May 23, 2015
The inspiration behind the movie A Beautiful Mind, John F. Nash was a legendary mathematician whose work in the area of game theory earned him the Nobel Memorial Prize in Economic Sciences. In his later years, he was riddled with mental illness. He later died in a car crash.
 12 
J. Robert Oppenheimer
(American Theoretical Physicist and Former Wartime Head of the ‘Los Alamos Laboratory’)
J. Robert Oppenheimer
18
Birthdate: April 22, 1904
Sun Sign: Taurus
Birthplace: New York, New York, United States
Died: February 18, 1967

Hailed as a brilliant scientific mind, American physicist J Robert Oppenheimer, led the Manhattan Project which resulted in the development of atomic bomb during the World War II. The bombs were dropped on the Japanese cities of Hiroshima and Nagasaki in 1945. However, Oppenheimer was in a constant conflict over the moral issue of the weapons of mass destruction and rallied against nuclear proliferation.

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 13 
Niels Bohr
(Physicist)
Niels Bohr
12
Birthdate: October 7, 1885
Sun Sign: Libra
Birthplace: Copenhagen, Denmark
Died: November 18, 1962
Nobel Prize-winning Danish physicist Niels Bohr is remembered for his work on the atomic structure and quantum theory. He laid down the Bohr model of the atom and established the Niels Bohr Institute. The element Bohrium has been named after him. He was also part of the British nuclear project.
 14 
Alexander Fleming
(Physician and Microbiologist Who Discovered ‘Penicillin’ World’s First Broadly Effective Antibiotic Substance)
Alexander Fleming
7
Birthdate: August 6, 1881
Sun Sign: Leo
Birthplace: Darvel, East Ayrshire, Scotland
Died: March 11, 1955

Alexander Fleming was a Scottish microbiologist and physician. He is credited with discovering penicillin, the world's first effective antibiotic substance; a discovery that changed the course of history. He also discovered lysozyme, an antimicrobial enzyme which forms part of the innate immune system. In 1999, Fleming was named in Time magazine's 100 Most Important People of the 20th century list.

 15 
John von Neumann
(Great Mathematician Who Were Equally at Home in Pure and Applied Mathematics)
John von Neumann
13
Birthdate: December 28, 1903
Sun Sign: Capricorn
Birthplace: Budapest, Hungary
Died: February 8, 1957
Hungarian-American scientist John von Neumann contributed to the development of game theory and the concept of self-replication. His work covered vast areas including math, economics, physics, and computer science. His research on nuclear physics led him to be part of the advisory committee of the U.S. Atomic Energy Commission.
 16 
Werner Heisenberg
17
Birthdate: December 5, 1901
Sun Sign: Sagittarius
Birthplace: Würzburg, Germany
Died: February 1, 1976
German theoretical physicist Werner Heisenberg is best known for pioneering quantum mechanics. He received the 1932 Nobel Prize in Physics. He had also helped Germany plan nuclear weapon strategies during World War II and was the director of what is now known as the Max Planck Institute for Physics.
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 17 
Erwin Schrödinger
8
Birthdate: August 12, 1887
Sun Sign: Leo
Birthplace: Erdberg, Vienna, Austria
Died: January 4, 1961
Austrian physicist Erwin Schrödinger, is best known for the "Schrödinger's cat" experiment, or the Schrodinger equation. His book What Is Life? explored genetics through physics. The Nobel Prize winner also wrote on a variety of topics, such as color theory and thermodynamics, and tried to create a unified field theory.
 18 
Richard Dawkins
(Evolutionary Biologist)
Richard Dawkins
24
Birthdate: March 26, 1941
Sun Sign: Aries
Birthplace: Nairobi, Kenya

Richard Dawkins is a British ethologist, author, and evolutionary biologist. He first achieved popularity after publishing his book, The Selfish Gene, which is credited with popularizing the gene selection theory. The book is also credited with introducing the term meme. In 2006, he established the Richard Dawkins Foundation for Reason and Science to promote secularism and scientific literacy.

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 19 
Ernest Rutherford
(New Zealand Physicist Who is Known as the Father of Nuclear Physics)
Ernest Rutherford
9
Birthdate: August 30, 1871
Sun Sign: Virgo
Birthplace: Brightwater, New Zealand
Died: October 19, 1937

New Zealand physicist Ernest Rutherford is remembered as the father of nuclear physics. His discovery of radioactive half-life and of radon, and his differentiation of alpha and beta radiation, won him the Nobel Prize in Chemistry in 1908. Element 104 was named rutherfordium in his honor.

 20 
Rosalind Franklin
10
Birthdate: July 25, 1920
Sun Sign: Leo
Birthplace: Notting Hill, London, England
Died: April 16, 1958
Chemist and X-ray crystallographer Rosalind Franklin is remembered for her pathbreaking X-ray diffraction studies of DNA, which helped in the Nobel Prize-winning discovery of the double helix structure of DNA by Francis Crick, James Watson, and Maurice Wilkins later. She also worked on the molecular structures of viruses. 
 21 
Homi Bhabha
(Indian physicist)
Homi Bhabha
6
Birthdate: October 30, 1909
Sun Sign: Scorpio
Birthplace: Mumbai, India
Died: January 24, 1966

Padma Bhushan-winning physicist Homi Bhabha revolutionized the Indian nuclear program singlehandedly. Born into an affluent family, he was educated at Cambridge. Initially geared toward a career in mechanical engineering, he later drifted to physics, eventually contributing to the formation of TIFR. The Bhabha Atomic Research Centre is named after him.

 22 
Max Planck
(Physicist)
Max Planck
5
Birthdate: April 23, 1858
Sun Sign: Taurus
Birthplace: Kiel, Germany
Died: October 4, 1947

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.

 23 
Subrahmanyan Chandrasekhar
(Astrophysicist Known for his 'Theoritical Studies of the Physical processes of importance to the Structure and Evolution of the Stars')
Subrahmanyan Chandrasekhar
14
Birthdate: October 19, 1910
Sun Sign: Libra
Birthplace: Lahore, Pakistan
Died: August 21, 1995

Remembered for his varied contribution to astrophysics, Subrahmanyan Chandrasekhar is perhaps best known for his work on the evolution of massive stars. Today known as Chandrasekhar limit, it contributed to final understanding of supernovas, neutron stars, and black holes. A prolific writer, he also did significant work on energy transfer by radiation in stellar atmospheres and convection on solar surface.

 24 
Enrico Fermi
(Italian Physicist, Nobel Laureate and Creator of the World's First Nuclear Reactor)
Enrico Fermi
5
Birthdate: September 29, 1901
Sun Sign: Libra
Birthplace: Rome, Italy
Died: November 28, 1954
Italian physicist Enrico Fermi created the Chicago Pile-1, the world's first nuclear reactor. Known widely as the "architect of the atomic bomb," he was equally proficient in theoretical and experimental physics, and won the 1938 Nobel Prize in Physics for his work on radioactivity and for discovering transuranium elements.
 25 
J. J. Thomson
(Physicist)
J. J. Thomson
7
Birthdate: December 18, 1856
Sun Sign: Sagittarius
Birthplace: Manchester, Lancashire, England
Died: August 30, 1940

J. J. Thomson was a British physicist credited with the discovery of the electron, the first subatomic particle to be discovered. He was awarded the Nobel Prize in Physics in 1906 for his work on the conduction of electricity in gases. In 1884, he was appointed Cavendish Professor of Physics at the University of Cambridge. 

 26 
Rachel Carson
(Marine biologist)
Rachel Carson
5
Birthdate: May 27, 1907
Sun Sign: Gemini
Birthplace: Springdale
Died: April 14, 1964

Rachel Carson was a conservationist, marine biologist, and author. She is credited with authoring an influential book titled Silent Spring, which played a significant role in advancing the global environmental movement. Carson is also remembered for her book, The Sea Around Us, which earned her a U.S. National Book Award. She was posthumously honored with the Presidential Medal of Freedom.

 27 
Kurt Gödel
(Mathematician, Philosopher and One of the Most Significant Logicians in History)
Kurt Gödel
9
Birthdate: April 28, 1906
Sun Sign: Taurus
Birthplace: Brno, Czech Republic
Died: January 14, 1978

Hailed as one of the greatest logicians since Aristotle, Kurt Gödel was Austrian-born American mathematician, logician, and philosopher, who earned international stardom for his incompleteness theorem. Also credited with developing a technique called Gödel numbering, he later started working on Mathematical Platonism, a philosophical theory that failed to attract wide acceptance.

 28 
Linus Pauling
(One of the Greatest Scientists of All Time & Winner of Two Nobel Prizes)
Linus Pauling
8
Birthdate: February 28, 1901
Sun Sign: Pisces
Birthplace: Portland, Oregon, United States
Died: August 19, 1994

Only person to win two unshared Nobel Prizes, Linus Carl Pauling was an American theoretical physical chemist, who received the 1954 Nobel Prize in Chemistry for his work on nature of chemical bond and 1962 Nobel Prize for Peace for his efforts to stop nuclear weapon testing. Also a prolific writer and educator, he has published 1,200 books and papers.  

 29 
Claude Shannon
(Mathematician, Engineer & Cryptographer Known as a 'Father of Information Theory')
Claude Shannon
5
Birthdate: April 30, 1916
Sun Sign: Taurus
Birthplace: Petoskey, Michigan, United States
Died: February 24, 2001

Claude Shannon was an electrical engineer, mathematician, and cryptographer. He is credited with publishing the article A Mathematical Theory of Communication which gave rise to the field of information theory. Hence, Shannon is considered the father of information theory. He is also credited with founding digital circuit design theory. During World War II, he contributed to the field of cryptanalysis.

 30 
Max Born
(Physicist)
Max Born
9
Birthdate: December 11, 1882
Sun Sign: Sagittarius
Birthplace: Wrocław, Poland
Died: January 5, 1970
From being home-schooled for being too sickly to attend school, Max Born went on to win the Nobel Prize in Physics for his contribution to quantum mechanics. Being a Jew, with the rise of the Nazi power, he lost his professorship at the University of Göttingen, and moved to Cambridge.
 31 
Wilhelm Rontgen
(Mechanical engineer, Physicist)
Wilhelm Rontgen
5
Birthdate: March 27, 1845
Sun Sign: Aries
Birthplace: Lennep, Remscheid, Germany
Died: February 10, 1923

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.

 32 
Francis Crick
(Co-discoverer of the Structure of the DNA Molecule, Nobel Prize Winner)
Francis Crick
10
Birthdate: June 8, 1916
Sun Sign: Gemini
Birthplace: Weston Favell, Northamptonshire, England
Died: July 28, 2004

Nobel Prize-winning British biophysicist Francis Crick is best known for his ground-breaking work to determine the structure of the DNA, along with James Watson, Maurice Wilkins, and Rosalind Franklin. He taught at various institutes, such as the Salk Institute, and was also awarded the Order of Merit.

 33 
Paul Dirac
(One of the Most Significant Physicists of the 20th Century and Nobel Laureate)
Paul Dirac
9
Birthdate: August 8, 1902
Sun Sign: Leo
Birthplace: Bristol, England
Died: October 20, 1984

English theoretical physicist and Nobel laureate Paul Dirac OM FRS, counted among leading physicists of the 20th century, made fundamental contributions in the early development of quantum electrodynamics and quantum mechanics. He derived the Dirac equation while the modern theory of antimatter began with one of his papers. His book The Principles of Quantum Mechanics remains an influential monograph on the subject.

 34 
Lord Kelvin
(Mathematician, Physicist)
Lord Kelvin
5
Birthdate: June 26, 1824
Sun Sign: Cancer
Birthplace: Belfast
Died: December 17, 1907

Lord Kelvin was a British mathematical physicist and engineer. He studied at the Glasgow University and proceeded to teach there as well. Besides his academic career, he also had a career as an electric telegraph engineer and inventor. He received the Royal Society's Copley Medal in 1883. Absolute temperatures are stated in units of kelvin in his honor.

 35 
G. H. Hardy
(Mathematician)
G. H. Hardy
15
Birthdate: February 7, 1877
Sun Sign: Aquarius
Birthplace: Cranleigh, England
Died: December 1, 1947

English mathematician G. H. Hardy is best recognised for his work and achievements in number theory and mathematical analysis, and also as mentor of distinguished Indian mathematician Srinivasa Ramanujan. He is noted for his essay on mathematics titled A Mathematician's Apology. He also made his mark in biology formulating a basic principle of population genetics called Hardy–Weinberg principle.  

 36 
Vint Cerf
(Computer scientist)
Vint Cerf
7
Birthdate: June 23, 1943
Sun Sign: Cancer
Birthplace: New Haven, Connecticut, United States
 37 
Emmy Noether
(Mathematician)
Emmy Noether
13
Birthdate: March 23, 1882
Sun Sign: Aries
Birthplace: Erlangen, Germany
Died: April 14, 1935

Emmy Noether was a German mathematician best remembered for her contributions to abstract algebra. She is credited with discovering Noether's theorem, which is regarded as a fundamental theorem in mathematical physics. One of the most important mathematicians of her generation and the most important woman in mathematics history, Emmy Noether developed theories of algebras, fields, and rings.

 38 
Paul Erdős
(Mathematician)
Paul Erdős
21
Birthdate: March 26, 1913
Sun Sign: Aries
Birthplace: Budapest, Austria-Hungary
Died: September 20, 1996

Hungarian mathematician Paul Erdős spent most of his childhood at home, due to his mother’s overprotectiveness after his sisters died of scarlet fever. Known for his eccentricity, he used his own vocabulary. His contributions include the Ramsey theory, and he skipped many university job offers to continue working independently.

 39 
Henri Poincare
(French Polymath and Mathematician Known as One of the Founders of the 'Field of Topology')
Henri Poincare
4
Birthdate: April 29, 1854
Sun Sign: Taurus
Birthplace: Nancy, France
Died: July 17, 1912
Known as The Last Universalist for his expertise in a variety of domains, French mathematician Henri Poincare conducted research that formed the basis of the modern chaos theory. Apart from his work on relativity and the three-body problem, he also laid the foundation of algebraic topology.
 40 
E. O. Wilson
(Biologist)
E. O. Wilson
7
Birthdate: June 10, 1929
Sun Sign: Gemini
Birthplace: Birmingham, Alabama, U.S.
Died: December 26, 2021

E. O. Wilson is an American naturalist, biologist, and writer. An influential biologist, Wilson has earned several nicknames, such as The Darwin of the 21st century. He has also been referred to as the father of biodiversity and the father of sociobiology. In 1995, he was ranked among the most influential American personalities by Time magazine.

 41 
John Horton Conway
(British Mathematician Known for His Contributions to 'Combinatorial Game Theory (CGT)')
John Horton Conway
12
Birthdate: December 26, 1937
Sun Sign: Capricorn
Birthplace: Liverpool, England
Died: April 11, 2020

Remembered as versatile mathematician, game wizard and polymath, John Horton Conway had limitless curiosity, which matched with his scientific originality. Although he is best known for devising the cellular automation called Game of Life, he made significant contributions to group theory, number theory, algebra, geometric topology, theoretical physics, combinatorial game theory and geometry. Conway published many outstanding papers in these fields.

 42 
Benoit Mandelbrot
(Mathematician and polymath)
Benoit Mandelbrot
20
Birthdate: November 20, 1924
Sun Sign: Scorpio
Birthplace: Warsaw, Poland
Died: October 14, 2010

Noted mathematician and polymath, Benoit B. Mandelbrot is perhaps best known for his work on fractal. He not only coined the term, but also used computer-constructed images to illustrate the mathematical definition. Also credited with the discovery of Mandelbrot set and Mandelbrot law, he established that even those things which were apparently chaotic or rough had a "degree of order".

 43 
Tim Berners-Lee
(Inventor of the World Wide Web)
Tim Berners-Lee
25
Birthdate: June 8, 1955
Sun Sign: Gemini
Birthplace: London, England

Widely known as ten inventor of the world wide web, Tim Berners-Lee made the first communication between an HTTP client and server through the internet in 1989. He is associated with various organizations, such as the W3C and the World Wide Web Foundation, and has received the knighthood, too.

 44 
Grace Hopper
(Computer Scientist, Mathematician and One of the First Programmers of the ‘Harvard Mark I’ Computer)
Grace Hopper
23
Birthdate: December 9, 1906
Sun Sign: Sagittarius
Birthplace: New York, New York, United States
Died: January 1, 1992
Computer scientist and U.S. Navy rear admiral Grace Hopper was one of the first programmers of the Harvard Mark I computing system. She pioneered the machine-independent programming language technique, and the FLOW-MATIC language used by her was later used to create COBOL. She received a posthumous Presidential Medal of Freedom.
 45 
Nikola Tesla
(Inventor, Engineer & Futurist, Who Obtained Over 300 Patents)
Nikola Tesla
27
Birthdate: July 10, 1856
Sun Sign: Cancer
Birthplace: Smiljan, Croatia
Died: January 7, 1943

Inventor, engineer and futurist, Nikola Tesla, is best remembered for his contribution to the development of the modern alternating current (AC) electricity supply system. A prolific inventor, he had around 300 patents for his inventions. Even though he earned a considerable amount of money, he had poor money management skills and died a poor man.

 46 
Wolfgang Pauli
(One of the Pioneers of Quantum Physics and Winner of 1945 Nobel Prize for Physics)
Wolfgang Pauli
5
Birthdate: April 25, 1900
Sun Sign: Taurus
Birthplace: Vienna, Austria
Died: December 15, 1958

Nobel Prize-winning Austrian physicist Wolfgang Pauli is remembered for his contribution to quantum physics and for laying down the Pauli principle. While he was initially married to a cabaret dancer, the marriage ended in a divorce after a year. His written works are considered classics in science.

 47 
Katherine Johnson
(Mathematician)
Katherine Johnson
37
Birthdate: August 26, 1918
Sun Sign: Virgo
Birthplace: White Sulphur Springs, West Virginia, United States
Died: February 24, 2020
Katherine Johnson was a physicist and mathematician, remembered as the first African-American female NASA scientist. Her calculations helped launch the space missions of Alan Shepard and John Glenn. She was crucial to the Apollo program and won a Congressional Gold Medal and a Presidential Medal of Freedom for her achievements.
 48 
Guglielmo Marconi
(Inventor of 'Radio' and Winner of 1909 Nobel Prize in Physics)
Guglielmo Marconi
12
Birthdate: April 25, 1874
Sun Sign: Taurus
Birthplace: Bologna, Italy
Died: July 20, 1937

Guglielmo Marconi was an Italian electrical engineer and inventor best remembered for his work on long-distance radio transmission. Marconi, who is credited with inventing the radio, was honored with the 1909 Nobel Prize in Physics for his work in the field of wireless telegraphy. Also a businessman, Marconi founded the Wireless Telegraph & Signal Company in 1897. 

 49 
A.P.J. Abdul Kalam
(Aerospace Scientist & 11th President of India)
A.P.J. Abdul Kalam
10
Birthdate: October 15, 1931
Sun Sign: Libra
Birthplace: Rameswaram, Tamil Nadu, India
Died: July 27, 2015
A. P. J. Abdul Kalam, India’s 11th president, had earlier been an aerospace scientist at DRDO and ISRO. Known as the “People’s President” and the “Missile Man of India,” he was instrumental in India's Pokhran-II nuclear tests. He died of a cardiac arrest while delivering a lecture at IIM Shillong.
 50 
Alexander Grothendieck
(French Mathematician and a Pioneer in the Field of 'Modern Algebraic Geometry')
Alexander Grothendieck
7
Birthdate: March 28, 1928
Sun Sign: Aries
Birthplace: Berlin, Germany
Died: November 13, 2014

Alexander Grothendieck was a 20th-century mathematician who was a leading figure in the creation of modern algebraic geometry. With his so-called "relative" perspective, he revolutionized many areas of pure mathematics. During his later career, he became a professor at the University of Montpellier. He is counted among the greatest mathematicians of the 20th century.