The Architecture of the Invisible
There’s a certain stillness to the spaces where Tsu-Jae feels most at home. When we met on November 26, 2024, we walked down into the engineering labs at Berkeley, moving through corridors that felt almost hidden from the rest of the world. The air was clean in a way you could sense more than smell. Machines hummed softly, steady and precise, doing work measured in billionths of a meter. It’s a place built for things you can’t see, and she moves through it with ease, as if the scale itself makes perfect sense.
Her life’s work lives in that invisible realm. Long before she became Dean of Berkeley Engineering or stepped into her role as President of the National Academy of Engineering, she was helping reshape the foundation of modern computing. The FinFET, a three dimensional transistor design she helped pioneer, changed the trajectory of the field. Instead of staying flat, the transistor rose upward, giving engineers more control over the flow of electrons and allowing chips to keep getting faster and more efficient at a moment when progress was beginning to stall. It’s the kind of breakthrough that rarely announces itself, but quietly underpins almost everything we now take for granted.
Listening to her talk about it, you don’t hear abstraction. You hear clarity. She describes the movement of electrons through a gate with a kind of fluency that feels almost physical, as if she can see it happening in real time. There’s beauty in the way she understands these systems, not as cold mechanisms but as structures with rhythm and balance.
What stayed with me, though, was how quickly the conversation moved beyond the chip itself. For Tsu-Jae, the wafer is only the beginning. The real question is what we build on top of it, and who it serves. She speaks about engineering as a responsibility, not just a discipline. The systems being designed now, from artificial intelligence to energy infrastructure to healthcare technologies, will shape the texture of daily life in ways we’re only beginning to understand. She thinks deeply about that. About who benefits. About who might be left out.
There’s a quiet warmth in how she talks about her students. You can see the teacher in her just as clearly as the scientist. She pays attention to people the way she pays attention to systems, noticing small differences, individual strengths. For her, engineering isn’t just about solving problems. It’s about choosing which problems matter, and understanding the human context around them. Technical skill alone isn’t enough. It has to be paired with judgment.
Now, her influence is widening. At the National Academy of Engineering, she’s helping guide conversations at a national level, advising on the kinds of decisions that shape entire industries and policies. But she doesn’t drift into abstraction. She keeps returning to the tangible, to the idea that every technical decision eventually lands somewhere real, in someone’s life.
When we stepped back out of the labs into the cool Berkeley air, the contrast was sharp. Bright light, open space, the visible world again. But it felt different after spending time below, thinking about everything happening just out of sight. Tsu-Jae works in that hidden layer, shaping the systems that quietly support how we live. And she’s just as focused on where all of it is going as she is on how it works.
