The MIT professor who taught the math behind every AI tool for 61 years gave the world something most universities never would

Gilbert Strang never set out to be an internet celebrity. He just wanted to teach math.

For 61 years, the MIT professor has been standing at the chalkboard, leading students through linear algebra, a subject that sounds boring until you realize it's the quiet force behind everything from Netflix recommendations to ChatGPT. When he finally stepped away in May 2023, at the age of 88, more than 6,000 people watched his last lecture live and the room gave him a standing ovation that went on long after he finished speaking.

But Strang’s true gift to the world was not to be found in that lecture room. It was on the internet and it was free.


The math most people didn’t know they needed
Linear algebra is the kind of thing you don't talk about at dinner parties. But if you use a smartphone, stream music or interact with any AI tool, you are very much living inside one.

Linear algebra is an essential component of modern machine learning algorithms and generative AI. Linear algebra is the bedrock of the massive computations practitioners perform, whether they are training a neural network, building a recommendation system, or performing dimensionality reduction on a complex data set. It’s the math plumbing that makes intelligent systems work.

Most people never get properly introduced to it. College classes are scary, books are expensive, and good teachers aren’t easy to find. And that is the gap that Strang has spent his career trying to fill.

From a classroom in Cambridge to 20 million views
Strang joined the M.I.T. faculty in 1962 and spent decades building a reputation as one of the nation’s clearest math teachers. His flagship course, 18.06 Linear Algebra, became a staple of MIT’s undergraduate curriculum.

MIT started OpenCourseWare in 2002, a program to make course materials online free of charge. Strang was one of the first professors to put his lectures in the OpenCourseWare series that made MIT’s rigorous curriculum free to millions online.

That was the tipping point. Suddenly, students who could not afford elite universities, professionals pivoting into tech, and self-taught developers trying to break into machine learning had access to world-class instruction. His lectures have received over 20 million views and are famous among both mathematicians and non-mathematicians for their engaging and clear delivery.

What set him apart
Strang didn’t teach like most math professors teach. He did not start with definitions and theorems. He began with concrete, visual, intuitive examples, letting the abstraction arise naturally.

He also cared a lot about how students felt in the classroom. He didn’t use language that made people feel slow. He often stopped to check if they were understanding him. In a field where students are often made to feel like they either “get it,” or they don’t, Strang normalized confusion as part of learning, not a personal failing.

It turned out to matter enormously online. They were not just getting MIT-level content that anyone could download his lectures from anywhere. It was like they were getting a teacher who actually wanted them to succeed.

Why it matters right now
Never before have math fluency and career opportunity been more important for millennials and Gen Z entering the workforce. Linear algebra is everywhere in high-growth areas such as data science, AI development, software engineering and more.

MIT OpenCourseWare has now had more than 210 million unique visitors and more than 70 percent of visitors are outside the United States, reflecting the global appetite for accessible, rigorous learning.

Strang’s lectures are still online. They are the same. There is no login, subscription or tuition fee. They’re just there, for anyone who needs them.

A legacy written in chalk
Strang wrote in the comments section of his last YouTube lecture, “Teaching has been a wonderful life.”

He never designed an app. He didn't start a business. He made things clear, and stood in front of a blackboard for 60 years. And because he made that work freely available, it will continue to teach people far beyond any classroom course that might have faded away.

Strang’s lectures unlock a door for anyone who’s ever felt excluded from the math that drives the modern world, no key required.