Ash Semmens

I’m Ash Semmens — a former Royal Australian Navy Clearance Diver, keynote speaker, mentor, coach and consultant. After nearly two decades serving in one of the military’s most demanding roles, I went on to successfully fin the English Channel — swimming the entire crossing on my back using fins. It was a world-first endurance achievement that demanded relentless discipline, mental control and resilience in one of the most unforgiving stretches of water in the world. That crossing wasn’t just a physical milestone; it was a deeply personal commitment to growth, service and supporting the veteran community.

My time in the Navy shaped the foundation of who I am. Working in high-pressure, high-risk environments — including operational deployments — taught me about leadership under stress, trust within teams, and the cost of silence when people are struggling. Like many veterans, I also faced the challenge of transitioning back into civilian life and navigating my own battles with PTSD. That experience profoundly shaped the direction of my work today.

Now, I speak to audiences across corporate, community and leadership environments about resilience, connection, leadership and the growing loneliness epidemic. My keynotes are grounded in lived experience — not theory — and focus on practical ways people can strengthen relationships, rebuild self-belief and perform under pressure. Beyond the stage, I work one-on-one as a mentor and coach, and partner with organisations as a consultant to improve culture, communication and wellbeing.

At the heart of everything I do is connection. I believe resilience is built through honesty, accountability and strong relationships — with ourselves and with others. Whether I’m on stage, in a mentoring session or working alongside a leadership team, my goal is simple: to help people move forward with clarity, courage and purpose.