Brian Balfour

Reforge founder, four-fits framework

Brian Balfour is the founder and CEO of Reforge, a cohort-based programme that trains product and growth professionals. Previously VP of Growth at HubSpot, he developed the four fits framework — market-product, product-channel, channel-model, and model-market fit — arguing that sustainable growth requires all four to reinforce each other. Reforge has become a primary credential for senior growth practitioners across the industry.