The data is in. Our obsession with content isn't helping.
Your brain has evolved to run on the rhythm of observe, predict, test, gather data, reflect and learn.
This rhythm is how human learning and growth happen.
But most people are now doing the opposite. They’re trying to control outcomes and cling to certainty. Obsessively trying to find the 'right way' to get it done. If something doesn’t go to plan or is a bit ambiguous, we too often freak out, judge ourselves, feel bad and retreat to what’s familiar, leaving us anxious, perfectionistic and stuck as a result.
Last year alone, the global personal development industry generated more than $48 billion. If transformation could be purchased, and if clarity, confidence or self-worth came bundled in modules, we would be the most fulfilled and grounded generation in history.
And yet, we're not. We are drowning in insight and starving for change.
Your brain doesn't change through consumption. It changes through doing. Through trying something, noticing what happens, learning from it, and going again. Not as a metaphor. As a mechanism.
That's the Experiment Mindset. And after a decade of leading people, another decade helping leaders and organisations get the best out of their teams and organisations, and a deep dive in to the science of human behaviour, it's now what my work is built on.
I'm Tamsin Simounds, an author, leadership coach and speaker applying the science of human growth to the way we live, lead and build careers. You'll find my book, The Experiment Mindset - Activating The Science of Personal Growth, launching with Wiley in May 2026, for pre-sale below. You can also check out my speaking and coaching services.
Start wherever makes sense, it's great to have you here.
Tamsin.
Work with Tamsin
Speaking
High impact, high resonance, zero fluff
Tamsin is a scientist by training and a philosopher at heart. She challenges the cult of high performance and makes the case for something better -- high personal growth cultures, where individuals, impact and income grow together.
Her keynotes are known for dynamic live experiments that leave audiences with more than inspiration.People walk away with tools they can use the next day.
Tamsin brings story, science and commercial sense to every stage. Her clients include major banks, fast-growth startups and large corporates across Australia.
Topics include:
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The Experiment Mindset
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Leading a High Personal Growth Culture
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The Science of Behaviour Change
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The Three Levers for Growth
1:1 Coaching
Move from successful but stuck, to living life on your terms.
Most coaching is an hour a week and a hope that something shifts. This isn't that.
We start with a half-day intensive -- just the two of us -- to uncover what you actually want, what's keeping you stuck, and to move the blocks that have been there longer than they should be.
Then we spend three months executing the strategy together.
It's designed for people who are successful by most measures and deep down frustrated by the gap between where they are and where they know they could be.
Ideal for founders in growth, leaders at an inflection point, and professionals who are done waiting for the right moment.
Workshops and Programs
A single keynote will shift room. It rarely shifts a culture.
Tamsin works with teams and organisations to embed the science of growth into how they lead, collaborate and perform.
Her programs are built around the Three Levers for Culture -- physiology, environment and psychology -- giving leaders a shared language, concrete tools, and a clear path from where they are to where they need to be.
She partners with you throughout, so the work integrates with your broader strategy rather than sitting beside it.
Ideal for organisations navigating change, leadership teams that have outgrown their current culture, and people and culture leaders who want something that actually sticks.
Ways to work together:
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Signature four-month program: Build a High Personal Growth Culture
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Team coaching to embed the Experiment Mindset across your organisation
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Custom intensives and offsite facilitation
I'm Tamsin Simounds
I bridge the gap between what people know, what people want,
and what they consistently do.
I spent my first decade in medical imaging and corporate healthcare before pivoting to spend the next decade coaching hundreds of executives and founders through growth, pressure and transformation.
That convergent experience -- science, leadership, organisational development, coaching, and the messy reality of building something -- led me to develop the Experiment Mindset Method: a practical, brain-aligned approach to change that bridges the gap between what people know and what they actually do.
I speak and run workshops for professional audiences across Australia, and have advised leaders across major banks, fast-growth startups and large corporates. My work has been featured in Smart Company, Thrive Global and Women's Agenda.
I bring science-backed frameworks, live-tested tools, and immediate calls to action. Because information doesn’t create change. Experience does.
I'm also the founder of JumpProof, an Australian absorbent activewear startup I've built using the same principles I teach. It is, in the truest sense, proof of concept.
I live on a small farm in regional South Australia with my husband, two sons, and more animals than is strictly reasonable.
If you lead people, build things, or simply refuse to stop growing -- this work is for you.
Trusted by leaders who take growth seriously.
“Tamsin has been an outstanding resource for PickStar and Myself personally. Our business has grown from 15 to 40 people in 15 months and it's fair to say our people and strategic processes were ragged and not clear.
Tamsin has been responsible for completely reshaping, focussing and aligning our organisational design. In parallel Tamsin worked with our global Senior leadership team assisting us to improve our trust, team dynamic and ability to be vulnerable. I have worked with many consultants in my time and Tamsin is right at the top.”
James Begley, CEO Pickstar
