Stanford public classes: 2,727 volunteer teachers, a steady 1:10 ratio for six years

chrispiech · x · 2026-10-02

Stanford professor Chris Piech shares that his public classes have drawn about 2,727 volunteer teachers over six years, with students outnumbering them roughly 10-to-1. He expected the ratio to shift dramatically for an online probability class, but it has remained consistent, highlighting the durability of the volunteer-driven teaching model.

Related event: Stanford open course keeps 1:10 volunteer teacher-student ratio over six years(2 posts)→

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