What You Do Is Who You Are

Why it’s on the list: Ben Horowitz’s argument that a culture is what a company actually does when the decision is costly, not the values written on a wall — built through historical cases before turning to how a founder sets a culture deliberately and enforces it. The companion to his operating book, aimed at the part of the job that is hardest to delegate.

Where I heard about it

• Fil Arons (@FilArons) — in the section he marks as required on his recommended-reading list (November 2025).

About this edition

The cases are Toussaint Louverture reprogramming a slave army, the samurai codifying bushido as a set of practices rather than beliefs, Genghis Khan’s meritocracy and inclusion of the conquered, and Shaka Senghor’s prison gang.

Connections

• Ben Horowitz — the author.
• The Hard Thing About Hard Things — his earlier book, on the operating decisions rather than the culture.
• Company Culture — the subject.
• Organizational Culture — the broader concept the historical cases are arguing about.