Stephen Walker is a founder and operator focused on applied AI, consumer health technology, and performance nutrition. He leads Klu.ai and is building Fuel Nutrition, an iOS and Apple Watch–integrated platform that turns nutrition science, biometrics, and coaching logic into personalized decision support. His work sits at the intersection of artificial intelligence, product strategy, digital health, behavior change, and subscription software. Stephen specializes in building AI-native products, go-to-market systems, and consumer software experiences that turn complex technical capabilities into clear, useful products.