Software builder · Mathematician · Vert skateboarder
William A. Stein
I build tools for collaborative computation, develop mathematical software for humans and agents, 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.
Research
Guides to modular forms, arithmetic geometry, and open computation.
WritingPapers
Fifty papers, preprints, and long-form research projects.
Long formBooks
Open texts, source material, and published books.
ArchiveTalks
Slides and supporting files spanning nearly two decades.
MentoringProjects
Student theses, junior papers, and directed course work.
DataTables
The historical modular forms and elliptic curves database.
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.