The Coaches
Two practitioners.One method.
The program is delivered by two people who have spent their careers in environments where performance is observed, measured, and consequential. They lead every session together.
Coach & Consultant
35 years coaching ATP, WTA and Olympic champions and senior leaders to perform when it counts.
David has coached ATP professionals including Liam Broady, Marcus Daniell, Marcelo Demoliner, Matwé Middelkoop, Samantha Murray, Wes Moodie, Kyle Edmund, and Jamie Delgado. At TeamBath he led a multidisciplinary team developing world-class athletes.
He is an officially recognized ATP Tour coach, an elected ATP committee member, and the author of Locker Room Power and Belief vs Confidence. He has delivered mindset workshops and consultancy for elite sporting environments including Chelsea, Fulham, Bolton Wanderers, England Rugby, and elite US college programs.
His work is grounded in mindset and performance under pressure — the discipline of staying clear and decisive when the stakes are real.
“Pressure is a privilege — it means you are doing something that matters.”David Sammel
Executive Coach & Leadership Expert
Executive coach and advisor to senior leaders on strategy, transformation, and AI.
25 years of senior executive experience at Google, Nike, The Coca-Cola Company, and McKinsey & Co. Stefanie founded TECA to connect how leaders behave with what the business needs to deliver.
Backed by a PhD in Business Administration and certifications from MIT (AI Leadership), UC Berkeley, and the ICF (PCC) — and shaped by years inside the rooms where the largest decisions get made.
She brings a deep understanding of how leaders operate inside complex organizations — and a high standard for what behavior in the room actually looks like.
“Leadership is not about having the answers. It is about creating the conditions in which the right answers can emerge — and then having the nerve to act on them.”Dr. Stefanie Teichmann
Why this combination
The Center Court and the Boardroom,held by two people who have lived in both.
Together, David and Stefanie lead The Winning Mix — an initiative that brings together the best of leadership from elite sport and senior business. The Winning Edge Series is their signature leadership program.
Most executive programs put a sports coach on stage as a metaphor and hand the room back to the consultants. We don't. David and Stefanie design and deliver every workshop together, in the room throughout, giving feedback as one voice. The work on court and the work in the room are the same conversation — which is what makes the pattern visible in a way neither discipline could surface alone.