In our streaming, selfie, and video call-filled world, one name often goes unmentioned. Yet, his invention touches almost every frame you’ve ever watched online.
Professor Nasir Ahmed is a softly spoken Indian-American engineer. He was born in Bangalore in 1940. He might just be one of the most important figures in the digital revolution. Without his mathematical breakthrough, the Discrete Cosine Transform (DCT), the internet would lack vision and sound as we know it today.
Ahmed’s pioneering work in data compression has allowed audio-visual content to travel swiftly. This applies from Zoom calls to JPEG images, and from Netflix marathons to YouTube clips. Without DCT, video conferencing wouldn’t exist. JPEGs would be bloated curiosities. Streaming services like Netflix, Amazon Prime, and YouTube? Technically implausible.
A Modest Giant of the Digital Age
Ahmed began his academic journey in the University College of Engineering in Bangalore. He later moved to the United States in the 1960s. There, he earned both his master’s and Ph.D. from the University of New Mexico. At the university, he served as a Professor of Electrical and Computer Engineering. He retired as Professor Emeritus in 2001 after an 18-year tenure.
In the 1970s, he developed the DCT with a team of researchers. This was a groundbreaking compression method. It reduces redundant data while preserving image and sound quality. His theoretical insights were instrumental in creating practical standards. These include JPEG for images and MPEG for video. They form the backbone of modern digital media.
Celebrated, Yet Humble
Despite the magnitude of his contributions, Ahmed remains relatively unknown outside academic and engineering circles. That’s slowly changing.
In 2020, the hit U.S. drama This Is Us aired an emotional episode. It was inspired by his work. The episode cast a spotlight on his groundbreaking achievements and personal life. Viewers were moved as they saw Nasir and his wife, Esther, celebrating their 56th wedding anniversary. They did this via a Zoom call, a piece of technology directly descended from his own inventions.
“It was a beautiful and surreal moment,” Ahmed told reporters in a recent interview. “To see something you helped create being used to connect you with your family—that’s the real reward.”
The Praise of Giants
Today, Ahmed’s influence is quietly celebrated by industry leaders and tech visionaries.
Sundar Pichai, CEO of Google, once remarked, “Without Nasir Ahmed’s DCT, we wouldn’t have efficient search indexing for multimedia. We wouldn’t have YouTube as we know it.”
Reed Hastings, Netflix co-founder, credited DCT as “the unseen engine of the streaming revolution.”
Marc Andreessen is the co-creator of the first web browser, Mosaic. He has called Ahmed’s contribution “a core part of the digital economy’s invisible scaffolding.”
And yet, for all this admiration, Ahmed remains grounded. Now in his 80s, he spends his time mentoring young engineers. He shares his story with students. Occasionally, he chats to journalists and documentary crews who’ve recently discovered the giant in their midst.
A Living Legacy
Professor Ahmed didn’t just invent a method—he sculpted the unseen infrastructure of the digital age. While others captured the spotlight, he gave the world its lens.
Millions binge-watch their favourite shows or connect with loved ones across continents. The pixels carry more than just entertainment or emotion. They carry the legacy of a man who saw the future in mathematical terms and made it real.
And perhaps most poetically of all, he and Esther sit down to watch Netflix together. They do so on a system. It wouldn’t have existed without the very equations he once scribbled on paper.
Five Places You’re Using Nasir Ahmed’s Invention Without Knowing It
The Hidden Genius of DCT in Your Everyday Life
- Netflix, Amazon Prime & YouTube
You rely on DCT every time you stream a movie. You also depend on it for a boxset or a viral cat video. It compresses vast amounts of video data into manageable streams without choking your bandwidth. Without it, you’d be watching buffering wheels—not blockbusters. - Zoom, FaceTime & Google Meet
You can enjoy a seamless video call. Connect easily with your grandmother, your boss, or your book club. It runs on DCT. DCT efficiently compresses video and audio data in real time. This makes it possible for faces and voices to travel around the globe in milliseconds. - Photos on Your Phone (JPEGs)
Snap a photo on your smartphone? The image is instantly compressed using JPEG, a format powered by—you guessed it—DCT. That’s how your phone stores thousands of photos without filling up instantly. - Digital TV & Blu-ray Discs
High-definition television, DVDs, and Blu-rays all use MPEG encoding. This method is built on DCT. It delivers crisp visuals and clear sound. Without DCT, watching anything in HD would be nearly impossible. - Social Media Platforms
Every image on Instagram, video on TikTok, or story on Facebook is compressed using DCT-driven formats. Your entire digital social life is gliding on the back of Nasir Ahmed’s math.
So next time you double-tap, stream, or Zoom, take a moment. Spare a thought for the man who made it all possible. He is hiding in the code beneath your thumbs.
