Leah Tharin is a Swiss product management veteran, solopreneur, and one of the most influential voices on Product-led Growth (PLG) in B2B SaaS. With 25+ years of operator experience — scaling Smallpdf to 50M monthly active users and GotPhoto to 20M+ ARR — she left full-time employment in November 2023 to build an independent advisory and content business. Her newsletter 'Leah's ProducTea' on Substack, her podcast, and her 58,000+ LinkedIn followers have made her a go-to resource for product and growth leaders navigating the shift from sales-led to product-led business models.
Lenny Rachitsky is the author of Lenny's Newsletter, the world's largest product-focused newsletter with 1.2M+ subscribers, host of a top-10 global tech podcast, angel investor in 130+ companies, and former product lead at Airbnb where he helped transform instant booking from 5% to 80%+ of all reservations. Born in Odesa, Ukraine to refusenik parents who emigrated to the US when he was six, Lenny built a lean, high-quality media empire that earns $3M+ annually — all from a home studio in Marin County, with a digital fireplace backdrop and a strict no-meetings-before-3pm rule.
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.
Ross Haleliuk is a Ukrainian-born, San Francisco-based cybersecurity entrepreneur, author, angel investor, and operator who built one of the industry's most influential newsletters, 'Venture in Security,' with 21,000+ subscribers. He authored the Amazon bestseller 'Cyber for Builders,' co-founded the world's first angel syndicate exclusively for security practitioners, and currently leads a stealth-mode cybersecurity startup as co-founder and CEO. With a background spanning history studies in Ukraine, product leadership in Canada, and a deep pivot into cybersecurity, he has become a leading voice on building, funding, and growing security companies.