# Jay’s Letter

> I am an investor. But I don’t write about managing money, I write about managing my mind - the most important tool in the tool-belt.

- **Platform:** substack
- **Category:** Lifestyle
- **Subscribers:** 31K
- **Last updated:** 2026-03-30
- **URL:** https://jaymartin.substack.com
- **Profile:** https://newsletterinsights.io/newsletter/jaymartin