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About us

One Stone Advisors is a dynamic, purpose-driven, women-owned sustainability advisory firm

Our global team  has been shaping  sustainability leadership and impactful client outcomes for over 30 years.

As early pioneers of corporate sustainability in Europe, we co-developed the Triple Bottom Line with John Elkington (People, Planet, Profit).

Now our core focus is helping organisations embed that thinking and align with the UN 2030 Agenda. And we believe the push for a fairer, more regenerative future starts with us. 

Our Vision

A world where sustainability leadership is mainstream.

Our Mission

Our Values

Empower for good

We share knowledge and networks with a focus on the future

We’re proud to be a B Corp

Sustainability is what we do—and core to who we are. We’ve been a certified B Corp in AANZ since 2019, with verified high standards of performance, transparency, accountability and continuous improvement.

In 2022 we successfully recertified with a B Impact Score of 134.7 points—among the highest in our sector and region and more than double the median score for most businesses.

We believe in the power of business to drive women’s economic empowerment, diversity and inclusion

We are a certified women-owned business with WEConnect International. By choosing us, you are uplifting women in business and demonstrating genuine commitment to a small, diverse and inclusive supplier.

We actively go beyond reducing adverse social, environmental and economic impacts to create net positive value

We are proud to support these initiatives:

We’re a passionate, dynamic, global team

Our pioneering women-led team has over 30 years at the leading edge of responsible business practice—across government, blue-chip multinationals and small business.
We bring the perfect balance of global expertise and local experience to empower effective sustainability leadership. We get the big picture, we also get the detail—and we care about quality outcomes.
 
As strategy, impact and engagement specialists, we work across a wide range of ESG topics and industries—including government, business, not-for-profit, arts, culture & tourism, finance, consumer goods, health & social services, infrastructure and transport.

Hover on our profiles to know more.

With 30 years at the leading edge of corporate sustainability, Andrea is an expert at strategic integration of ESG and the SDGs for measurable positive impact. One of Australia’s first trained B Consultants, a B Council member and Banksia judge, she brings a wealth of global best practice and stakeholder insight to your leadership journey.

Alex is a Social Impact consultant with a special focus on risk, culture and human rights. In addition to helping organisations anticipate, navigate and manage emerging psychosocial risks, she is also highly experienced in B Corp recertification.

Fran’s forte is helping emerging sustainability leaders focus on what matters most. At C-suite level, she asks the right questions, guides priority-setting and helps turn climate ambition to reality. Fran is a former Board Member of the Scottish Environment Protection Agency and B Corp Ambassador.

If you’re looking to embed responsible business, see Jacqueline. Her core strength is guiding large organisations through the transformation process to become better corporate citizens. Formerly with Unilever, Jacqueline is also a lecturer and researcher at the University of NSW.

Barbara is our carbon guru. A registered Climate Active consultant and Co-CEO of 100% Renewables, she specialises in helping large energy users develop net zero strategies and achieve carbon neutrality.

For award-winning sustainability writing and reporting, Amy is the person to talk to. She has 17 world class reports in her portfolio, along with high-level policy papers on human rights and the SDGs, ethics training modules, modern slavery statements and more.

Kay is passionate about helping organisations unleash the power of Diversity & Inclusion. As well as an author, executive coach and consultant, she is visiting lecturer at leading business schools and Founder and CEO of Diversity and Performance BV, based in the Netherlands