Jack Gierlich

Jack Gierlich is a Brooklyn-based growth marketing founder and fractional CMO who has spent 15+ years scaling healthcare, SaaS, and AI companies. He leads marketing and growth at Leal Health (formerly TrialJectory), an AI-powered platform that helps cancer patients find advanced treatment options, and he moderates several of the largest marketing and business communities on Reddit, reaching millions of readers a month. He describes his craft as building marketing systems that compound rather than one-off campaigns.