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    Ryan Holiday

    Author and media entrepreneur of Daily Stoic, a major voice in direct audience building, newsletters, and owned media.

    What AI says about them

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    Ryan Holiday is an author and entrepreneur who uses a commonplace book and index card system to manage his knowledge and create content.

    Google AI Mode
    He is an author who champions a classic, tactile, analog powerhouse: The Index Card System / Commonplace Book.
    Copilot logoCopilot
    He uses a note card system and the idea of building a second brain to capture, organize, and transform knowledge into creative output.
    ChatGPT
    He represents a very old-school, human-centered approach to building a knowledge system: the commonplace book + deliberate synthesis.
    Gemini logoGemini
    He is best known for popularizing an analog, tactile system centered around physical books, marginalia, a commonplace book, and a 4x6 index card filing system.
    Perplexity
    He popularized a practical, writer-oriented version of the commonplace book: a physical, topic-based archive of ideas, quotations, evidence, and observations stored on index cards.

    5 of 5 AI engines recognize them, measured 19 Sep 2026. Descriptions are generated by AI systems and can be wrong.

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