Greg LewisWorking Papers

Models, simulators and explainers I build to understand something properly. Each one is a working paper: finished enough to use, open to revision.

  1. No. 13Oct 2026

    Intro to Bond Yields

    Rates are back in the news, so I went back to what actually moves them.

  2. No. 12Sep 2026

    Should New Grads Join a Startup?

    Students hear the upside of a startup job and rarely the downside.

  3. No. 11Aug 2026

    A Draft Board for the Casual Fan

    Spent your summer doing something more rewarding than refreshing X? I've got you covered.

  4. No. 10Aug 2026

    Two-Minute Drill

    Three hundred real NFL endgames. Make the calls; a simulator takes over when you diverge.

  5. No. 09Aug 2026

    Chess Coach

    I wanted an opponent that plays at my level, not against it.

  6. No. 08Jul 2026

    Glass Box RAG

    I wanted to watch a retrieval system think before it answers.

  7. No. 07May 2026

    AdventureWorks Chat

    What a reporting tool looks like when you can just ask it. The SQL is shown, the chart drawn.

  8. No. 06May 2026

    Religious Voices

    Leaders across eight traditions and two centuries, answering in their own published words.

  9. No. 05Apr 2026

    NFL Prospect Comparables

    Every draft prospect looks like someone who came before him.

  10. No. 04Apr 2026

    2026 Draft: Talent vs. Market ↗

    A model's view of the draft class against the analysts'. The gap is the story.

  11. No. 03Apr 2026

    March Madness 2026 ↗

    Four bracket models, one tournament, scored week by week as it played out.

  12. No. 02Dec 2025

    Startup Exit: Sell or Scale?

    A founder's question with a number attached: cash out today, or build the firm someone else will pay more for.

  13. No. 01Oct 2024

    EMBA: Is It Worth It?

    Does an executive MBA pay back? Mostly it depends on what you do with the savings.