About John Stewart

John Stewart is a systems thinker operating across product growth, technology, and human performance. He builds companies, writes about systems, and advises organizations on growth architecture.

His work sits at the intersection of product-led growth, AI-enabled experimentation, and the disciplined pursuit of sustainable performance. He believes the best outcomes come from well-designed systems — not heroic effort.

John has spent his career in product experimentation, conversion optimization, and growth strategy. He's built multiple products, advised early-stage companies, and developed frameworks used by product teams globally.

Areas of Expertise

• — Product-led growth
• — Experimentation & conversion optimization
• — AI-enabled product strategy
• — Analytics & personalization (Adobe Target, etc.)
• — Performance systems & mental models
• — Entrepreneurship & digital businesses

Beyond Work

When not building or writing, John can be found supporting Wrexham AFC, training (strength and endurance), or reading. He believes that what you do outside of work compounds into what you produce within it.