Podcast
Opinionated History of Mathematics podcast.

Geometry
Modern and classical, including history and philosophy.

Manifesto on the Teaching of Mathematics
Being a declaration of the principles on which these works are based.

Intuitive Infinitesimal Calculus
Being a textbook instantiating the aforementioned philosophy.

History of Mathematics
An introduction including many readings from original sources.

Blog
Containing assorted remarks on the foregoing subjects.

About
Who is the illustrious author of these perceptive writings?