Brian Balfour is the founder and former CEO of Reforge, the professional development platform for experienced product, growth, and marketing practitioners that grew to 100,000+ alumni before being acquired by Miro in March 2026. Now Chief Growth Officer at Miro, he is best known for the Four Fits Framework - the thesis that Product-Market Fit alone cannot drive $100M+ growth, and that market, product, channel, and model must all interlock. A former VP of Growth at HubSpot, serial entrepreneur, and Venture Partner at Long Journey Ventures, Balfour is one of the most influential thinkers in the product-led growth movement.
Rosie Hoggmascall is a London-based product and growth expert specialising in subscription apps, monetisation, and product-led growth. With a Cambridge education and a career spanning strategic communications to leading consumer tech startups, she is currently Chief Product & Growth Officer at Fyxer AI - an email productivity tool that grew from $1M to $30M ARR in 2025. She also runs 'Growth Dives', a weekly Substack newsletter delivering annotated product teardowns to 2,000+ subscribers with a remarkable 64% average open rate.