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• A Letter a Day

  Letters from Investors, Founders, and Operators.

  20 posts · theirs

Lately

• 30 Lessons at 30

  A Letter a Day · 2026-08-08

• Letter #339: Oscar Hattink (2026)

  A Letter a Day · 2026-08-04

• Letter #338: Mala Gaonkar and Nicolai Tangen (2026)

  A Letter a Day · 2026-07-29

• Letter #337: Angela Aldrich, Michael Mauboussin, and Tano Santos

  A Letter a Day · 2026-07-14

• The Document

  A Letter a Day · 2026-07-10

• Letter #336: Alex Karp (2026)

  A Letter a Day · 2026-07-06

• Letter #335: Peter Kagan, David Foley, and Zach Schreiber (2015)

  A Letter a Day · 2026-06-29

• The Structural Case for Open-Source AI

  A Letter a Day · 2026-06-26

• Letter #334: Deven Parekh (2025)

  A Letter a Day · 2026-06-25

• SpaceX is building a planetary starter kit

  A Letter a Day · 2026-06-16

• Letter #333: Luca Ferrari (2026)

  A Letter a Day · 2026-06-10

• Alphabet is Berkshire Hathaway 2.0

  A Letter a Day · 2026-06-06

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