The Greatest
Black Scientists
From ancient African scholars to Nobel laureates and NASA pioneers — a curated tribute to the Black scientists whose discoveries changed humanity’s understanding of the world.
This page profiles twenty of the greatest Black scientists in history — selected for the magnitude of their discoveries, the barriers they overcame, and the lasting mark they left on human knowledge. Many of their names were erased from textbooks. AfroScience is putting them back.
Each profile includes their field, key achievements, and the context that makes their story essential.
Katherine Johnson
A mathematician of extraordinary precision, Katherine Johnson calculated the orbital trajectories that made America’s first spaceflights possible. NASA’s astronauts trusted her figures above the early computers’ — John Glenn famously refused to fly unless she personally verified his orbital re-entry calculations. Over 35 years at NASA, she authored or co-authored 26 research reports, pioneering methods still fundamental to space navigation.
In 1893, Daniel Hale Williams performed one of the world’s first successful open-heart surgeries — suturing the pericardium of a stabbing victim who survived. He founded Provident Hospital in Chicago, the first hospital in the US with an interracial staff, and later reorganised the Freedmen’s Hospital in Washington. He was a founding member of the American College of Surgeons.
Charles Drew revolutionised modern medicine by developing techniques for blood storage and transfusion that created the first large-scale blood banks. His research during World War II saved tens of thousands of lives through the Blood for Britain project and the American Red Cross blood bank. He developed the concept of the “bloodmobile” — the mobile blood donation unit — still used worldwide today.
Ernest Just was one of the foremost cell biologists of the twentieth century. His pioneering research at the Marine Biological Laboratory at Woods Hole established fundamental understandings of fertilisation, cell division, and the role of the cell surface in biological processes. His landmark book The Biology of the Cell Surface (1939) remained a foundational text for decades and foreshadowed discoveries in molecular biology.
Percy Julian synthesised physostigmine (a treatment for glaucoma) and was the first to mass-produce cortisone and progesterone from soy proteins — making these life-saving drugs affordable for millions for the first time. He held over 100 patents and founded his own pharmaceutical company. Julian’s synthetic cortisone transformed the treatment of rheumatoid arthritis, while his work on steroids laid groundwork for modern hormone therapy and the birth control pill.
The first African American woman to earn a PhD from MIT (1973), Shirley Jackson conducted groundbreaking research in theoretical physics — particularly in subatomic particles and condensed matter physics. Her research at Bell Labs contributed to the development of caller ID, call waiting, fibre-optic cables, solar cells, and the technology behind the portable fax machine. She later became the first Black woman to lead a major research university as President of Rensselaer Polytechnic Institute.
Alice Ball was a chemist who, at just 23 years old, developed the first effective treatment for leprosy (Hansen’s disease) — an injectable oil extract from the chaulmoogra plant. Her method, known as the “Ball Method,” was used for decades but credited to a male colleague after her early death. She was only recognised posthumously, when the University of Hawaiʻi awarded her a posthumous medal of distinction in 2000. Her work transformed the lives of thousands of patients.
Mae Jemison became the first African American woman to travel to space when she flew aboard the Space Shuttle Endeavour in September 1992. A physician, chemical engineer, and NASA astronaut, she conducted bone cell research in microgravity and logged over 190 hours in space. After leaving NASA, she founded the 100 Year Starship project — an initiative to develop the technology for human interstellar travel within a century.
The first African woman to win the Nobel Peace Prize (2004), Wangari Maathai founded the Green Belt Movement in 1977 — mobilising Kenyan women to plant over 51 million trees, combat deforestation, and restore degraded ecosystems. A trained biologist and the first woman in East and Central Africa to earn a PhD, she connected environmental science to democracy, women’s rights, and community development in ways that reshaped global conservation thinking.
Gladys West is the hidden mathematician behind GPS. Working at the Naval Surface Warfare Center from the 1950s, she developed the mathematical models and programmed the early computers that calculated an extraordinarily precise model of the Earth’s shape — the geodetic model at the foundation of the Global Positioning System. Her work was declassified and her contribution recognised only in 2018, when she was inducted into the Air Force Space and Missile Pioneers Hall of Fame.
While Thomas Edison is credited with the lightbulb, it was Lewis Latimer who made it practical for everyday use. Latimer invented the carbon filament — replacing Edison’s fragile paper filament — allowing bulbs to last far longer and be mass-produced. He also drafted the patent drawings for Alexander Graham Bell’s telephone. A founding member of the Edison Pioneers, his technical work was central to electrifying the modern world. He later wrote the first book on electric lighting.
Mamie Phipps Clark was a psychologist whose “doll studies” — demonstrating that Black children internalised racial inferiority imposed by segregation — were cited as evidence in the landmark Supreme Court case Brown v. Board of Education (1954), helping end school segregation in the United States. She was the first Black woman to receive a PhD in psychology from Columbia University, and co-founded the Northside Center for Child Development in Harlem.
Neil deGrasse Tyson is one of the most influential astrophysicists and science communicators of his generation. As director of the Hayden Planetarium and host of Cosmos: A Spacetime Odyssey, he has brought the universe to hundreds of millions of people worldwide. His academic research spans star formation, dwarf galaxies, and the Milky Way’s bulge. He has advised US presidents on science and space policy and is one of the most recognised public scientists in the world.
Born in Nigeria, Oluyinka Olutoye is a pioneering paediatric surgeon and scientist who has performed operations of extraordinary complexity — including surgeries on foetuses still in the womb. In 2016, he led a landmark surgery to remove a massive tumour from a 23-week-old foetus, return it to the womb, and allow it to continue developing. He co-directs the Fetal Center at Texas Children’s Hospital and holds patents in regenerative medicine.
Cheikh Anta Diop was a Senegalese historian, anthropologist, physicist, and politician who argued that ancient Egypt was a Black African civilisation and the foundational source of Greek and Western science and philosophy — a thesis he supported with archaeological, linguistic, and melanin-dosage evidence. He founded a radiocarbon laboratory in Dakar — the first of its kind in sub-Saharan Africa — and applied carbon-14 dating to African archaeological sites, establishing rigorous scientific methods for African history.
Philip Emeagwali won the 1989 Gordon Bell Prize — computing’s equivalent of the Nobel — for programming a massively parallel computer to perform the world’s fastest computation at that time: 3.1 billion calculations per second. His work modelling oil reservoir fluid dynamics contributed directly to techniques used in petroleum extraction. He connected 65,000 microprocessors to simulate the flow of oil and in doing so helped define the architecture of the modern internet.
Norbert Rillieux invented the multiple-effect evaporator — a revolutionary industrial process that transformed sugar refining from a dangerous, labour-intensive method into a safe, efficient, and cheaper system. Patented in 1843, his invention dramatically reduced production costs across the sugar industry and was later adapted for soap, gelatin, condensed milk, and glue manufacturing. His principles of energy efficiency remain embedded in industrial engineering today.
Otis Boykin invented a wire precision resistor that became crucial to guided missiles and IBM computers. More importantly, he developed an improved electrical resistor that was adopted in pacemakers — the small device that keeps millions of hearts beating at safe rhythms worldwide. Holding 26 patents in total, his inventions are found in televisions, radios, military guidance systems, and the cardiac devices that have saved countless lives since the 1960s.
Mark Dean holds three of IBM’s nine original patents on the personal computer — including the design for the Industry Standard Architecture (ISA) bus that allowed multiple devices to connect to the PC, fundamentally enabling the modern computer ecosystem. He led the team that created the first one-gigahertz chip processor in 1999. He was also part of the team that built the first colour PC monitor. A member of both the National Academy of Engineering and the National Inventors Hall of Fame.
Marie M. Daly
Marie Maynard Daly was the first African American woman to earn a PhD in chemistry in the United States, completing her doctorate at Columbia University in 1947. Her groundbreaking research established the connection between cholesterol and clogged arteries — foundational knowledge for cardiology and the prevention of heart disease. She also contributed to the understanding of how proteins are synthesised and how histones interact with nucleic acids, research that preceded the decoding of DNA. Daly later established a scholarship fund for minority students in science.
A century of breakthroughs
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