Software builder · Mathematician · Vert skateboarder
William A. Stein
I build tools for collaborative computation, write mathematical software, and preserve the work and photographs collected on this site since the 1990s.
Current work
Open tools for serious computation
Founder and CEO of SageMath, Inc. I lead the development of CoCalc and have worked on SageMath and open mathematical computing for two decades.
Mathematics
Writing, teaching, and computation
The public record of my research and teaching, from books and papers to decades of slides and computational data.
Beyond the work
A personal web archive
This site has accumulated photographs, travel, teaching, old projects, hardware notes, and snapshots of the early mathematical web for several decades.