One of the most inspiring and influential people I've read. Many of the ideas he expressed are more commonplace as of the last five or ten years though—embodied cognition and autopoiesis are part of the conceptual underpinning of all sorts of modern perspectives and movements.

Less often recommended, this book shaped a lot of my thinking: https://www.amazon.com/Tree-Knowledge-Biological-Roots-Under...

For anyone wanting to understand thought and the way we acquire knowledge, I would highly recommend the book The Tree of Knowledge (https://www.amazon.com/Tree-Knowledge-Biological-Roots-Under...)