Ton Roosendaal is brilliant both strategically (taking a closed source codebase and growing it into the open source success story that is Blender today) but also as a person.
When I was 15 or so, mid 2000s, I was heavily into the Blender community. Shortly after the closed source to open source transition I ran into a segfault. I could half heartedly sling code at the time but not enough to work out the issue I had.
After noting the issue on IRC Ton personally helped tease out the bug. I _might_ have misdirected him by saying the bug occurred "with just a cube" (and he was like "Yay! Bugs are easier when they're simple cases!") but I neglected to note it was a cube subdivided half a dozen times, with a few thousand vertices ;)
He had a vision and quiet persistent execution plan for Blender and the community that was far ahead of anything else in those (relatively) early days of OSS and the web.
The Blender community was and is an amazing combination of technology, creativity, and positivity, and I think we owe Ton for helping steward much of it.