Forgotten Genius Fridays
Forgotten Genius Friday: The Mystery Behind Thomas Jennings’ Portrait
Thomas Jennings portait: A disputed 19th-century photograph raises questions about whether the famous portrait of inventor Thomas L. Jennings may actually depict Jamaican National Hero Paul Bogle. Explore the historical mystery.
Last Updated on June 9, 2026 by Daily News Staff
When STM Daily News featured inventor Thomas L. Jennings in our Forgotten Genius Friday series, we celebrated a remarkable American innovator whose achievements helped pave the way for future generations of Black inventors. Jennings earned a place in history in 1821 when he became the first African American known to receive a U.S. patent for his dry-cleaning process known as “dry scouring.”
But after publishing our story, we encountered an intriguing historical mystery that raises an important question:
Was the portrait commonly identified as Thomas Jennings actually Thomas Jennings?
A Photograph with Two Identities
For years, a dignified 19th-century portrait has circulated across educational websites, social media posts, historical publications, and videos as an image of Thomas Jennings. The photograph has become one of the most recognizable images associated with the inventor.
However, researchers have pointed out that the very same photograph is also widely used in Jamaica as a portrait of Paul Bogle, the Baptist deacon and national hero who led the Morant Bay Rebellion in 1865.
The result is a fascinating historical puzzle. How can the same image represent two different men from two different countries?
The Challenge of Historical Verification
The controversy highlights a challenge that historians face regularly: not every historic photograph comes with complete documentation.
Many images from the 19th century have been copied, republished, and archived countless times over the decades. In some cases, original labels, ownership records, and identifying information are lost. Once a caption appears in a book or archive, later publications may repeat it without independently verifying the source.
Over time, an assumption can become accepted as fact.
Researchers examining the Jennings-Bogle image have noted that there is no universally accepted chain of evidence proving the identity of the individual in the photograph. As a result, some historians consider the attribution uncertain.
Why It Matters
At first glance, the debate may seem like a minor issue involving an old photograph. Yet it carries broader significance.
Thomas Jennings represents innovation, entrepreneurship, and the struggle for civil rights in early America. His patented dry-cleaning process was groundbreaking, and he used his success to support abolitionist causes and educational opportunities for African Americans.
Paul Bogle represents resistance, justice, and the fight against colonial oppression in Jamaica. His leadership during the Morant Bay Rebellion ultimately influenced political reforms and earned him recognition as one of Jamaica’s National Heroes.
Both men deserve to have their stories told accurately.
What We Know for Certain
While the identity of the photograph remains disputed, the achievements of Thomas Jennings are not.
Historical records confirm that Jennings received his patent in 1821 and built a successful business from his invention. He used his influence and resources to support the abolitionist movement and advocate for greater equality during a period when opportunities for African Americans were severely limited.
Whether or not the famous portrait truly depicts Jennings, his contributions to American history remain undeniable.
The Importance of Continuing Research
History is often presented as a collection of settled facts, but new discoveries and questions emerge all the time. The discussion surrounding the Jennings-Bogle photograph reminds us that historical research is an ongoing process.
Sometimes the most interesting stories are not only about what we know—but also about what we are still trying to learn.
As historians, archivists, and researchers continue to examine the evidence, the mystery of the photograph remains unsolved. Until stronger documentation emerges, the image stands as a reminder that history is not only about preserving the past, but also about questioning assumptions and seeking the truth.
Forgotten Genius Friday
Thomas L. Jennings remains one of America’s pioneering inventors and an important figure in the history of innovation. Regardless of the outcome of the portrait debate, his legacy continues to inspire inventors, entrepreneurs, and changemakers today.
Editor’s Note: The portrait commonly attributed to Thomas L. Jennings has been the subject of ongoing historical debate. The same image has also been used in Jamaica as a portrait of National Hero Paul Bogle. Researchers continue to investigate the photograph’s origins, and no definitive scholarly consensus has yet emerged regarding the identity of the individual depicted.
Further Reading
- National Inventors Hall of Fame – Thomas L. Jennings and American Innovation
- U.S. Patent and Trademark Office – National Inventors Hall of Fame Museum
- Jamaica Information Service – Paul Bogle Biography
- Thomas L. Jennings Biography and Historical Overview
- Paul Bogle Biography and Legacy
Discover more inspiring stories of overlooked innovators, pioneers, and changemakers in our Forgotten Genius Fridayseries. Visit STM Daily News at www.stmdailynews.com to explore the lives and legacies of remarkable individuals whose contributions helped shape our world but are often left out of the history books. While you’re there, join the conversation in the comments and sign up for our newsletter so you never miss a new story.
STM Blog
From Hand Signals to Smart Crosswalks: The Evolution of the Modern Pedestrian Signal
Discover the history of the modern pedestrian signal, from Garrett A. Morgan’s groundbreaking traffic signal to today’s smart, accessible crosswalks.
Last Updated on July 12, 2026 by Daily News Staff
Every day, millions of people rely on pedestrian signals to cross busy street safely. A glowing white walking figure, an orange-red hand, and a countdown timer have become familiar sights around the world. While these signals may seem like simple pieces of infrastructure, they are the result of more than a century of innovation, engineering, and public safety improvements.
The modern pedestrian signal did not appear overnight. Instead, it evolved through the contributions of inventors, engineers, city planners, and transportation officials who continually refined traffic control systems as cities grew and automobiles became more common.
The Early Days of Traffic Control
Before electric traffic signals, intersections were controlled by police officers, railway-style semaphores, or even hand signals. As horse-drawn wagons gave way to automobiles in the early 1900s, traffic congestion and accidents increased dramatically, creating an urgent need for better traffic management.
One of the earliest electric traffic lights was installed in Cleveland, Ohio, in 1914. It used red and green lights and was manually operated. While it improved vehicle movement, pedestrians still had to judge for themselves when it was safe to cross.
Garrett A. Morgan’s Breakthrough
One of the most important milestones came in 1923 when inventor and entrepreneur Garrett Augustus Morgan received U.S. Patent No. 1,475,024 for an improved traffic signal.
Morgan’s design introduced a third position in addition to “Stop” and “Go.” This intermediate phase temporarily stopped traffic in every direction before allowing vehicles to proceed. The brief pause reduced confusion at intersections and provided additional time for pedestrians to cross safely.
Morgan reportedly developed his design after witnessing a serious traffic accident. His invention demonstrated how thoughtful engineering could improve public safety while making increasingly busy streets more efficient.
Although Morgan did not invent the illuminated “WALK” and “DON’T WALK” pedestrian signal used today, his three-position signal became a foundational step in the evolution of modern traffic control.
The Birth of Dedicated Pedestrian Signals
As cities expanded after World War II, pedestrian safety became an even greater concern. More people were walking in increasingly crowded downtown districts, and separating pedestrian movements from vehicle traffic became a priority.
During the early 1950s, several American cities began experimenting with dedicated pedestrian signals. New York City became one of the first major municipalities to install illuminated “WALK” and “DON’T WALK” signs at busy intersections.
These early systems gave pedestrians their own designated crossing phase, reducing conflicts with turning vehicles and improving safety at some of the nation’s busiest intersections.
Standardization Across America
By the 1960s and 1970s, traffic engineers recognized the importance of creating consistent traffic control devices nationwide.
The Manual on Uniform Traffic Control Devices (MUTCD) established national standards for traffic signs, pavement markings, and pedestrian signals. Standardized designs helped ensure that pedestrians could understand crossing signals regardless of where they traveled in the United States.
Eventually, words gave way to internationally recognized symbols—a walking person to indicate it was safe to cross and an upraised hand to indicate pedestrians should wait. These symbols transcended language barriers and improved accessibility for visitors and non-English speakers.
The Countdown Era
One of the most significant modern improvements arrived with pedestrian countdown timers.
Rather than simply flashing a warning, countdown displays show exactly how many seconds remain before the crossing phase ends. Research has shown that countdown timers help pedestrians make better crossing decisions and improve compliance with traffic signals.
Today, countdown timers have become standard equipment at intersections across much of the United States.
Accessibility Takes Center Stage
Modern pedestrian signals are designed to serve everyone.
Accessible Pedestrian Signals (APS) now provide audible tones, spoken messages, vibrating push buttons, and locator sounds that assist pedestrians who are blind or have low vision. These features allow more people to navigate intersections independently and safely.
The continued development of accessible technology reflects a broader commitment to making transportation systems inclusive for all users.
The Future of Pedestrian Safety
Pedestrian signals continue to evolve.
Many cities now use smart traffic systems that detect pedestrians waiting to cross, automatically adjust signal timing based on traffic conditions, and prioritize people walking during busy periods.
Researchers are exploring artificial intelligence, connected vehicle technology, and sensor-based systems capable of communicating directly with autonomous vehicles. Future pedestrian crossings may adapt in real time to weather conditions, crowd sizes, emergency vehicles, and even the needs of older adults or individuals with disabilities.
A Legacy Built by Many Innovators
The pedestrian signal we know today is the product of more than a century of collaboration and innovation.
Early traffic engineers created the first electric traffic lights. Garrett A. Morgan improved intersection safety with his groundbreaking three-position traffic signal. Transportation agencies standardized traffic control devices, while engineers continued refining pedestrian technology through countdown timers, accessible features, and intelligent traffic systems.
Every safe crossing today reflects the work of countless inventors, planners, researchers, and public officials dedicated to protecting lives.
As cities continue to grow and transportation technology advances, the humble pedestrian signal remains one of the most effective—and often overlooked—public safety innovations ever developed.
At STM Daily News, we celebrate the inventors, engineers, and visionaries whose everyday innovations quietly improve life for millions of people. Sometimes the most important inventions aren’t the ones that grab headlines—they’re the ones we depend on every single day without giving them a second thought.
Related Reading
- Federal Highway Administration – Manual on Uniform Traffic Control Devices (MUTCD)
- National Museum of African American History and Culture – Garrett Augustus Morgan
- United States Patent and Trademark Office
- Federal Highway Administration – Accessible Pedestrian Signals
- National Highway Traffic Safety Administration (NHTSA)
🧠 Discover the remarkable innovators, inventors, and trailblazers who helped shape our world but rarely receive the recognition they deserve. Share your thoughts in the comments and subscribe to the STM Daily News newsletter to catch every new Forgotten Genius Friday feature and more inspiring stories delivered to your inbox.
Forgotten Genius Friday
When people think about space exploration, they often remember the astronauts who traveled beyond Earth. But behind every mission are engineers, scientists, and inventors who create the technology that makes those journeys possible.
One of those innovators is Ellen Ochoa — an engineer, inventor, and astronaut whose work helped advance optical technology and opened new possibilities for space exploration.
Her story is not only about reaching the stars. It is about creating the tools that help humanity understand the world around us.
A Curiosity for Science and Discovery
Born on May 10, 1958, in Los Angeles, California, Ellen Ochoa developed an early interest in learning and problem-solving. She studied physics at San Diego State University before earning advanced degrees in electrical engineering from Stanford University.
Her path was shaped by curiosity, determination, and a passion for using science to solve real-world challenges.
Before becoming an astronaut, Ochoa was already making history as an engineer.
The Technology Behind the Vision
Ochoa specialized in optical systems — technology that allows machines to analyze and interpret images.
Her research led to inventions involving optical inspection systems designed to improve how computers process visual information. These technologies helped with tasks such as detecting defects, analyzing patterns, and improving automated systems.
Through her work, Ochoa became a co-inventor on several patents related to optical technology.
Her inventions demonstrated an important idea: exploration is not only about traveling farther — it is also about developing better ways to observe, measure, and understand.
Breaking Barriers at NASA
In 1990, Ellen Ochoa was selected as an astronaut candidate by NASA.
Three years later, she made history aboard the Space Shuttle Discovery mission, becoming the first Latina to travel into space.
During her NASA career, Ochoa completed four space missions and spent nearly 1,000 hours in orbit. Her missions focused on scientific research, Earth observation, and advancing our understanding of space.
She became a symbol of possibility for future generations of scientists, engineers, and explorers.
Leading the Next Generation of Space Exploration
Ochoa’s impact continued after her astronaut missions. She later became the first Latina to serve as director of NASA’s Johnson Space Center, helping guide one of the world’s most important space organizations.
Her leadership helped inspire new generations to pursue careers in science, technology, engineering, and mathematics.
A Legacy Beyond the Stars
Ellen Ochoa’s journey reminds us that innovation can come from many places. Sometimes the greatest discoveries begin with a question, an idea, or a new way of looking at a problem.
She did not just travel into space — she helped create the technology that made discovery possible.
For Forgotten Genius Friday, Ellen Ochoa represents what the series celebrates: the innovators whose brilliance changed the world, even before many people knew their names.
Her inventions helped us see the future. Her journey helped others believe they could reach it.
Learn More About Ellen Ochoa
- NASA – Ellen Ochoa Biography
- NASA Johnson Space Center
- National Women’s History Museum – Ellen Ochoa
- Encyclopaedia Britannica – Ellen Ochoa
- NASA STEM Education
- Google Patents – Search Ellen Ochoa’s Patents
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Forgotten Genius Fridays
Forgotten Genius Friday: Frederick McKinley Jones — The Inventor Who Changed How the World Keeps Food Fresh
Before fresh food could travel thousands of miles, before life-saving medicines could be shipped across long distances, and before grocery stores could offer products from around the world year-round, there was a major challenge: keeping things cold while they were on the move.
One inventor helped solve that problem.
His name was Frederick McKinley Jones—a brilliant engineer whose refrigeration technology transformed transportation, agriculture, healthcare, and modern supply chains.
A Self-Taught Mechanical Genius
Born in 1893 in Cincinnati, Jones faced challenges early in life. Orphaned at a young age, he developed an interest in mechanics and technology, teaching himself valuable skills through hands-on experience.
Rather than following a traditional educational path, Jones learned by repairing machines, studying engineering concepts, and experimenting with technology.
His natural ability eventually led him to work on inventions involving sound equipment, motion pictures, and electronics—but his greatest contribution would come from solving one of the world’s biggest transportation problems.
Solving the Cold Storage Challenge
Before Jones’ invention, transporting perishable goods over long distances was extremely difficult. Food, medicine, and other temperature-sensitive products could spoil before reaching their destinations.
Jones developed a portable refrigeration system that could be mounted on trucks and trailers, allowing goods to remain refrigerated while being transported.
His invention created the foundation for what is now known as the cold chain—the global network that keeps products at controlled temperatures from production to delivery.
The Birth of Modern Refrigerated Transport
Jones partnered with businessman Joseph Numero to create a company that would eventually become Thermo King.
Their refrigeration technology changed industries worldwide.
It allowed:
- Farmers to ship fresh produce farther than ever before
- Grocery stores to offer a wider variety of foods
- Hospitals to transport temperature-sensitive medical supplies
- The military to move food and medicine during wartime
A Life-Saving Innovation
During World War II, Jones’ refrigeration systems became especially important. His technology helped transport blood, medicine, and food safely to military locations.
His invention was not just about convenience—it helped save lives.
Recognition for a Forgotten Genius
Despite the enormous impact of his work, Jones remained relatively unknown to the public for many years.
In 1977, he was inducted into the National Inventors Hall of Fame, recognizing his groundbreaking contributions to refrigeration technology.
His inventions continue to influence the way the world moves essential goods today.
Why Frederick McKinley Jones Still Matters
Every time you buy fresh produce from another state, receive temperature-sensitive medicine, or enjoy foods transported across long distances, you are benefiting from technology that traces back to Jones’ innovation.
His story reminds us that some of the most important inventions are not always flashy. Sometimes, they are the systems working quietly behind the scenes that make modern life possible.
Final Word
As part of STM Daily News’ Forgotten Genius Friday series, the story of Frederick McKinley Jones highlights the power of problem-solving and persistence.
He didn’t just invent refrigeration for transportation—he helped create the modern world’s ability to share food, medicine, and resources across the globe.
Frederick McKinley Jones was the genius who kept the world moving—and kept it fresh.
Related Links for Further Information
- National Inventors Hall of Fame – Frederick McKinley Jones
- Google Patents – Frederick McKinley Jones Patent Records
- United States Patent and Trademark Office (USPTO) – Patent Search Database
- U.S. Energy Information Administration – Frederick M. Jones Biography
- Thermo King – The Legacy of Frederick McKinley Jones and Transport Refrigeration
- Frederick McKinley Jones – Biography and Inventions Overview
- U.S. Army – “The King of Cool”: How Jones’ Technology Supported Military Logistics
- Explore More Forgotten Genius Friday Episodes on STM Daily News
