Hi, I’m Ethan Tsai (Ming-Yao Tsai in publication), a Ph.D. in Mathematics and author of the Calculus Volume 1–3 series available on Amazon (in both print and ebook formats).

My mission is to help you not just learn calculus, but truly understand it — with clarity, confidence, and joy. Over the years I’ve developed a complete learning system that connects rigorous logic with intuitive insight, so you can see how each concept fits into the bigger picture.

In my courses you’ll find step-by-step lessons, clear notes, and numerous examples that make complex ideas simple to grasp. My teaching philosophy focuses on connections over memorization — helping you build a solid conceptual framework rather than just follow steps.

I’ve guided students from high school to university levels, helping them overcome fear and confusion in math by showing that success depends not on talent but on method and mindset.

If you’ve ever felt that calculus was just a maze of formulas, I’ll show you how it can become a language — one that describes change, motion, and patterns in the world around you. Welcome to a journey where you can finally master calculus with clarity.