.png)
Brian Balfour founded Reforge in 2016 after running growth at HubSpot. The newsletter and the Reforge program effectively built the modern growth discipline. Most of the frameworks you've heard quoted in growth meetings (loops over funnels, market-product fit, product-channel fit) trace back to one of his essays.The newsletter is closer to The Atlantic than Substack. Each post is meant to be definitive. He spends weeks on a single piece, then doesn't publish again until the next one is ready. The result is a low-volume archive where every essay is worth a re-read 12 months later.Recent work has focused on AI: the next great distribution platform (his bet is ChatGPT), how product teams should restructure with AI as a teammate, and what 'AI-native' product strategy looks like in practice.
What lands in your inbox.
Long-form essays on growth strategy, frameworks, and AI
Co-hosted Unsolicited Feedback podcast with Fareed Mosavat
Quality over quantity. Brian publishes when he has something to say.
Connection to the broader Reforge program ecosystem
Cross-pollination via frequent Lenny's Podcast appearances
Notable editions
The Next Great Distribution Shift
Why ChatGPT is becoming the next major platform, and how to be visible on it.
Four Fits to 100M+
The framework series: Market-Product, Product-Channel, Channel-Model, Model-Market fit.
Growth Loops are the New Funnels
Co-written with Casey Winters, Kevin Kwok, and Andrew Chen. The post that made 'loops' the dominant mental model in growth.
AI Native Product Teams
How product orgs should restructure when AI is a teammate, not a tool.
The honest take
What We Love
- Reshapes how you think about growth at the system level
- Frameworks survive the test of time
- No filler. Brian writes when he has signal.
- The Unsolicited Feedback podcast is a strong companion
Watch Out For
- Sporadic schedule. Sometimes weeks or months between posts.
- Essays are long. Not snackable.
- Less tactical. You'll need to operationalize the frameworks yourself.
