American growth practitioner who was VP of Growth at HubSpot and co-founded Reforge — the most rigorous professional development program for senior product and growth leaders — known for frameworks on growth loops, retention, and product-market fit.
Created Reforge and the practitioner-level growth curriculum — Reforge's program structure (cohort-based, senior-only, practitioner-taught) defined a new category of advanced professional education for tech product people, and Balfour's essays on growth loops and retention became standard references.
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