Reforge / Brian Balfour

Growth Loops + Four Fits frameworks

Brian Balfour is the founder and CEO of Reforge, a professional development programme for senior product and growth practitioners. Previously VP of Growth at HubSpot, he built a track record executing growth at scale before turning that experience into curriculum. He is best known for the Growth Loops model, which reframes acquisition as self-reinforcing systems rather than funnels, and the Four Fits framework, which maps the interdependencies between market, product, channel, and business model.