--- title: SRI welcomes Sillman Thomas, deepening support for organisations across the capital spectrum description: SRI Welcomes Sillman Thomas, Deepening Its Climate and Nature Finance Expertise. image: https://insights.sri-executive.com/hubfs/iStock-1275828304.jpg --- [![SRI LOGO - PURPLE](https://insights.sri-executive.com/hubfs/SRI%20LOGO%20-%20PURPLE.svg "SRI LOGO - PURPLE")](https://www.sri-executive.com/) ![Hamburger](https://insights.sri-executive.com/hubfs/raw_assets/public/SRI_Executive_July2022/images/hamburger.svg "Hamburger") [![Contact Us](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/25608414/cb5600f7-ef20-403a-b3b5-3fdfa2b4a080.png)](https://hubspot-cta-redirect-eu1-prod.s3.amazonaws.com/cta/redirect/25608414/cb5600f7-ef20-403a-b3b5-3fdfa2b4a080) - [Executive Search](https://www.sri-executive.com/executive-search/) - Executive Search - [Executive Search](https://www.sri-executive.com/executive-search/) - [Board Recruitment](https://www.sri-executive.com/board-recruitment/) - [Executive Recruitment](https://www.sri-executive.com/executive-recruitment/) - [Multiple Hires](https://www.sri-executive.com/multiple-hires/) - [Consulting](https://www.sri-executive.com/consulting/) - Consulting - [Consulting](https://www.sri-executive.com/consulting/) - [Strategy Development & Evaluation](https://www.sri-executive.com/strategy-development-and-evaluation/) - [Organisational Effectiveness](https://www.sri-executive.com/organisational-effectiveness-at-sri-executive/) - [Leadership](https://www.sri-executive.com/leadership/) - [Governance](https://www.sri-executive.com/governance-2/) - [About Us](https://www.sri-executive.com/about-us/) - About Us - [About Us](https://www.sri-executive.com/about-us/) - [Our Values](https://www.sri-executive.com/values/) - [Our People](https://www.sri-executive.com/our-team/) - [Our DEIA Commitment](https://www.sri-executive.com/diversity/) - [Our Sustainability](https://www.sri-executive.com/sustainability/) - [Opportunities](https://www.sri-executive.com/opportunities/) - Vacancies - [Vacancies](https://www.sri-executive.com/opportunities/) - [Work With Us](https://www.sri-executive.com/work-with-us/) - [Our Insights](https://insights.sri-executive.com/) ![](https://insights.sri-executive.com/hubfs/iStock-1275828304.jpg) # SRI welcomes Sillman Thomas, deepening support for organisations across the capital spectrum Published by [Alison McGardle & Jack McGardle](https://insights.sri-executive.com/author/alison-mcgardle-jack-mcgardle) on Sep 17, 2026, 9:11:42 AM **Sillman Thomas has joined SRI, bringing deep expertise in climate and nature finance and further strengthening our ability to support organisations, investors, and leaders across the capital spectrum.**   We're delighted to share that SRI has welcomed Sillman Thomas, a specialist firm in climate and nature finance, to our global team. This marks an exciting step in SRI's evolution and reflects the changing needs of the organisations we serve. By bringing together Sillman Thomas' expertise in sustainable finance with SRI's long-standing executive search and consulting capabilities, we are expanding our ability to help clients across the capital spectrum to navigate an increasingly complex global impact landscape.   ### Responding to a Changing Global Impact Landscape The global impact sector is undergoing profound change. Traditional donor funding is under pressure, while private and blended finance continue to grow in importance. Organisations are exploring new approaches to financing development and climate action, and leaders are being asked to operate across increasingly interconnected sectors. At the same time, the scale of the challenge remains immense. Developing countries face significant financing gaps in achieving the Sustainable Development Goals, while trillions of dollars of investment are required to meet global climate and nature objectives. Across the sector, organisations are undertaking major strategic reviews, evolving their operating models, and seeking leaders equipped to navigate this new environment. Against this backdrop, the combination of SRI and Sillman Thomas creates a stronger platform to support organisations across the full spectrum of impact finance and development.   ### Bringing Together Complementary Expertise Sillman Thomas brings deep expertise and networks across institutional investors, asset managers, carbon markets, and the broader sustainable finance ecosystem. Combined with SRI's experience supporting multilaterals, international financial institutions, NGOs, foundations and mission-driven organisations in more than 70 countries, the expanded team offers expertise that spans philanthropy, development finance, blended finance, climate and nature finance, impact investing and mainstream investment markets. Together, we are better positioned than ever to help organisations find exceptional leaders, strengthen teams, shape strategy and deliver impact at scale.   ### A Shared Vision for Impact "The global impact system is experiencing its most significant shift in a generation," said **Hannah Wylie, Founder of Sillman Thomas and now Advisor, Climate and Nature at SRI Executive**. "Donor funding, blended finance and private capital are increasingly converging in practice, even where organisations continue to operate separately. By bringing our expertise together, we can better support the organisations mobilising finance, shaping policy and delivering solutions on the ground, wherever they sit on that spectrum." The combined client base spans multilaterals, international financial institutions, NGOs, foundations, investors, asset managers, carbon market intermediaries, project developers, accelerators and private sector organisations working across global health, humanitarian action, human rights, food systems, climate and nature.   ### Looking Ahead Commenting on the announcement, **Jack and Alison McGardle, Co-Managing Directors of SRI Executive**, said: "Sillman Thomas brings exactly the expertise our clients need as the relationship between donor funding, impact investing and private capital continues to evolve. Their experience across investors, asset managers and carbon markets complements the work we have built over three decades with multilaterals, IFIs, NGOs and foundations. Most importantly, they share our values, our commitment to impact, and our dedication to clients and candidates. Together, we can support organisations across the full capital spectrum and help them find the leaders needed to thrive in a changing world. We are delighted to welcome Hannah and the Sillman Thomas team to SRI." As we bring our teams together, we're excited about the opportunities ahead and what this means for our clients, candidates and partners. We'll be sharing more over the coming months. For now: **Welcome to SRI, Sillman Thomas. We are excited to begin this next chapter together.**   Tags: [Executive Search](https://insights.sri-executive.com/tag/executive-search) [Back to Blog](https://insights.sri-executive.com) - [Tweet](https://twitter.com/share) ## Related Articles ## [The year past and what’s ahead: global development trends we’re watching in 2022](https://insights.sri-executive.com/the-year-past-and-whats-ahead-global-development-trends-were-watching-in-2022) As we look back on 2021, it was a year of global challenges, including COVID-19, climate change,... [Read More](https://insights.sri-executive.com/the-year-past-and-whats-ahead-global-development-trends-were-watching-in-2022) ## [2024 in Review: Progress, Partnerships, and Preparing for 2025](https://insights.sri-executive.com/2024-in-review-progress-partnerships-and-preparing-for-2025) As we enter 2025, we're taking a moment to reflect on the lessons and achievements of 2024 - while... 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