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We help purpose-driven leaders make change that sticks.

It shouldn’t feel this hard to embed change. 

You’re doing important work. But as things grow, shift, or become more complex, it can start to feel heavier than it should. Not because the intent isn’t there. But because what sits underneath isn’t fully supporting it. 

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That’s where we come in. 

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We work alongside organisations doing meaningful work, helping shape the right direction and strengthen how things actually operate, so change doesn’t just start well, it holds. 

The organisations we work with

We tend to meet organisations at a point where something important is shifting.

Growth that’s stretching the system. A strategy that needs to land properly this time. 

Change that’s already in motion, but harder to hold together than expected. 

Sometimes that looks like a smaller organisation where too much still sits with the CEO. 

Sometimes it’s a larger system where complexity is increasing and alignment is harder to maintain. 

Different contexts. But a similar feeling:
Things are more fragile than they should be. 

That’s usually where we start. 

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For smaller organisations

You’re leading a mission-driven organisation through a significant moment growth, restructure, or a strategic reset that must actually land.

The pressure is real. The stakes are high. And right now, more of the system runs through you than it should. You’re not lacking vision or commitment.

What’s missing is the operating rhythm, decision-making clarity, and leadership alignment to carry the strategy forward with confidence. 

That’s where we come in. 

Release the Pressure
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For larger organisations

You’re managing complex transformation across a large, sophisticated system. Multiple workstreams. Competing priorities. A team that’s capable but stretched. 

You’ve probably experienced what happens when change is coordinated across too many providers, the only things that become clear are  the fragmentation, the retelling of context, the drift. 

We embed as a senior partner. One accountable point of contact who holds the whole picture and helps your organisation move with less friction, more clarity, and real traction. 

Send Me Help
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How we started and why it matters today

Three6 was built on a belief that felt obvious but wasn’t common:

That purpose-led organisations doing important work should have access to the same quality of strategic support as the largest corporations.

Too often, we saw the opposite.  

Recycled frameworks, Generic recommendations, solutions that looked right but didn’t hold.  

The result? 

- Strategies that started strong, then faded. 
- Change that never quite embedded.  
- Teams left carrying more than they should.  

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We built something different.

An approach grounded in understanding first, shaping solutions together, and staying long enough to make sure the change actually holds. 

Eight years and more than a hundred projects later, that’s still how we work. 

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Why Three6?

Three6 came from Nina’s birthday. She came up with the name at 17, while travelling around Melbourne teaching maths, English, and science to students aged 3 to 18. Helping people succeed has always been part of who she is. 

It’s a small detail, but it reflects something important. 

We’re human first. Structured second. We care about the numbers, but we care just as much about what sits behind them. 

How we show up

We’re a values-led organisation through and through. We live these, talk about them, and they show up in how we work with you.  

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Challenge

We don’t pretend to have all the answers. What we do have is a genuine curiosity and the willingness to question assumptions - including our own. For our clients, this means you get a partner who asks the questions others might not. 

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Happiness

We believe in doing work that matters and finding meaning in it. There’s a level of energy and care we bring that you can feel, even when the work itself is complex. 

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Authenticity

We bring our whole selves. No corporate masks, no generic consulting speak. Our different perspectives make us more creative, and our honesty with clients is what builds real trust. 

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Nurture

Uplifting others is at the heart of everything we do. We grow alongside our clients sharing knowledge, building capability, and leaving organisations stronger than we found them. 

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Excellence

We take pride in quality. Not perfection, but genuinely high-quality work that our clients can feel, that their boards can see, and that their teams can sustain. 

Our process makes change stick.

PURPOSE SYSTEMS PEOPLE CUSTOMER

We don’t impose a framework. We work with you to shape something that fits your organisation and takes into account your people, your culture, your pace – what we call the Three6 Lens. 

We look at the connection between: 

Individually, each of these can make sense. But it’s how they connect, and where they don’t,  that determines whether change actually works. That’s where we focus. 

How this comes to life:

While every engagement is shaped to the organisation, the way we move through the work is consistent. 

We start by Discovering what’s really going on beneath the surface, not just what’s visible, but what’s driving it. 

We then Align around what matters most, creating clarity on direction, priorities, and what needs to shift. 

From there, we Co-design the way forward with you, grounded in your context, your people, and how the work actually happens. 

And importantly, we stay to Make it stick, embedding the change into day-to-day practice so it holds beyond the initial push. 

It’s a simple structure. 

But it’s what allows us to consistently move from good ideas to change that actually lasts. Before we suggest anything, we get under the surface. We spend time with your people, your systems, your real pressures. Because change that sticks starts with genuine understanding and not assumptions. 

This process has been used across 100+ engagements in healthcare, aged care, education, and beyond. 

Our People

At Three6, our people are more than just experts. They’re the driving force behind everything we do. We’ve brought together a team of passionate individuals who are not only brilliant at what they do but are also committed to making a real difference.

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Nina Muhleisen

Founder & Principal Consultant

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Amelia Hosseini

Senior Consultant

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Desiree Grant

Consultant

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Tara Heylin

Principal Consultant, Head of Process

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Jules Rountree

Consultant

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Georges Klopotowski

Senior Consultant

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Mia Andrea Uy

People & Operations Manager

Where we have worked. 

We’ve worked with organisations across health, education, aged care, and government. Different contexts. Different challenges. But often, the same underlying patterns. 

Much of our work comes through long-term partnerships and referrals. 

Which tells you more than any case study. 

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If this feels familiar, it’s worth a conversation 

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We’ll take the time to understand what’s going on, talk it through with you, and help you get clearer on what needs to shift. A conversation that’s useful. 

Get clear on what needs to shift
Explore how we work
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