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Brian Balfour

Substack
blog.brianbalfour.com· irregular· Inactive for over a year

Brian Balfour, founder of Reforge and former HubSpot VP Growth, writes essays on how AI changes product and growth strategy, such as his refresh of the Four Fits framework. Readers get strategic frameworks, M&A analysis of tech companies, and promotion for Reforge's AI growth courses.

growth strategyfour fitsproduct market fitgrowth loopsai growthproduct-led growthreforgesaas acquisitionsatlassianstartup strategygrowth frameworks
Platform
Substack
Frequency
Irregular
Latest issue
Oct 2, 2025
Language
English
Written for
Growth leaders, product managers, founders and startup operators
Tone
analytical
Tracked since
Oct 25, 2026

Website: https://blog.brianbalfour.com