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This is the guy who taught me calculus! All of his lectures are available online! I copied the rest from another post:

An MIT professor taught the same math course for 62 years, and the day he retired, students from every country on earth showed up online to watch him give his final lecture.

His name is Gilbert Strang.
The course is MIT 18.06 Linear Algebra.
Every machine learning engineer, every data scientist, every quant, every self-taught programmer who actually understands how AI works learned the math from this one man Most of them never set foot on MIT's campus.
They just opened a free playlist on YouTube and let him teach.

Here's the story almost nobody tells you.
Strang joined the MIT math faculty in 1962.
He retired in 2023 That is 61 years of standing at the same chalkboard teaching the same subject to 18-year-olds.

The interesting part is what he did when MIT launched OpenCourseWare in 2002 Most professors were skeptical.
They worried that putting their lectures online would make their classrooms irrelevant Strang did not hesitate.
He said his life's mission was to open mathematics to students everywhere He filmed every lecture and gave it away.

The decision quietly changed how the world learns math.

For decades linear algebra was taught the wrong way. Professors started with abstract vector spaces and proofs about field axioms. Students drowned in the abstraction Most never recovered They walked out believing they were bad at math when they had simply been taught in an order that nobody's brain is built to absorb.

Strang inverted the entire curriculum.

He started with matrix multiplication Something you can write down on paper Something you can compute by hand Something you can see Then he showed his students that everything else in linear algebra eigenvectors, singular value decomposition, orthogonality, the four fundamental subspaces was just a different lens for understanding what the matrix was actually doing under the hood.

His rule was strict If a student could not explain a concept using a concrete 3 by 3 example, that student did not actually understand the concept yet The abstraction was supposed to come last, not first. The intuition was the foundation The proofs were just confirmation that the intuition was correct.

The second thing Strang changed was the classroom itself. He said please and thank you to his students. Every single lecture. He paused mid-derivation to ask am I OK? to check if anyone was lost. He never used the word obviously or trivially because he knew exactly what those words do to a student who is one step behind. He treated 19-year-olds learning math for the first time the way he treated his own colleagues. With patience. With respect. With the assumption that they belonged in the room.

For 62 years.

The result is something that has never happened in the history of education. A single math professor became the default teacher of his subject for the entire planet.

Universities in India, China, Brazil, Nigeria, every country with a computer science department, started telling their own students to just watch Strang's lectures. The University of Illinois revised its linear algebra course to do almost no in-person lecturing. The reason was honest. The professor said they could not compete with the videos.

His final lecture was in May 2023.

The auditorium was packed with students who had never met him before.
He walked to the chalkboard, taught for an hour, and at the end the entire room stood and applauded.
He looked confused for a moment, like he genuinely did not understand why they were cheering. Then he smiled and waved them off and walked out.

His written comment under the YouTube video of that final lecture was four sentences long.
He said teaching had been a wonderful life. He said he was grateful to everyone who saw the importance of linear algebra. He said the movement of teaching it well would continue because it was right.

That was it. No book promotion.
No farewell speech No legacy management.

The man whose teaching is the foundation of modern AI just thanked the audience and went home.

20 million views. Zero ego. The entire engine of the AI revolution sits on top of math that millions of people learned for free from one quiet professor in Cambridge.

The course is still on MIT OpenCourseWare. Every lecture, every problem set, every exam, every solution. Free.

The most important math course of the 21st century is sitting one click away from you. Most people will never open it.

Check comments for a link to his page

Thank you Neil Sackmary and everything you have done for our community. May you R. I. P. 🙏

Infinity The Math Institute 6 likes, 2 comments. "The Best Math Tutoring Firm/ BBB Interview"

Participating in the Nevada School Choice event with Valeria Gurr is always awesome! Seeing friends in education and introducing ourselves to new families is what it’s all about. We teach kids math and adults financial literacy. May we continue to have a positive impact on our community 🤓🤩🙏

Merry Christmas and Happy New Year! 🤓🙏

Do you want your son or daughter to send texts like this and earn grades like this? Most importantly, do you want your kids to actually learn the material so they can use it for future math class success and make better decisions as an adult? Sign up for tutoring with Infinity and Mr. Bru and give a gift this Christmas that will change their life forever 🤓🙏

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A review of Teach Like It Matters from Kristine

5.0 out of 5 stars

A Powerful Reminder of Why Teaching Matters
Reviewed in the United States on December 14, 2025

Teach Like It Matters: Because It Does is an incredibly moving and affirming read for educators at any stage of their journey. John Bruchhagen captures the heart of teaching through real voices, real impact, and real moments that remind us why this profession is so meaningful—especially on the hard days.

What makes this book stand out is its authenticity. The letters and reflections from students are emotional, inspiring, and deeply validating. They serve as proof that even when teachers feel unseen or exhausted, their words, patience, and belief in students truly matter—often more than they realize.

This book is not about theory or trends; it’s about purpose. It’s a reminder that teaching is about relationships, persistence, and showing up for students again and again. I found myself smiling, tearing up, and reflecting on my own classroom experiences throughout the book.

I would highly recommend Teach Like It Matters: Because It Does to teachers, administrators, mentors, and even parents. It’s the kind of book you keep nearby—to revisit when you need encouragement, motivation, or reassurance that what you do truly makes a difference.

Well done, John. This book matters—because teaching does.

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