Our People
Governance Framework
Advisory Board - Institutional Expertise
Yanna Esterleyn
Founder & Chief Executive Officer at Sustany Global
Yana Esterleyn is the Founder of Sustany Global, a renewable energy and infrastructure development platform focused on originating, structuring, and delivering utility-scale projects across emerging markets. She brings over 16 years of experience in international business, with deep expertise in project development, financial structuring, and government engagement.
She has co-led the advancement of large-scale energy initiatives, including a 1 gigawatt solar program in the Democratic Republic of the Congo, working closely with public authorities and institutional partners to structure bankable projects and align them with development finance institution standards. Her work focuses on speed and disciplined project execution, risk allocation, and the integration of environmental and social frameworks required for long-term infrastructure investment.
Prior to Sustany, Yana served as Chief of Operations at TransCash, where she oversaw international expansion and operational systems across Europe. She holds an MBA from the University of Southern California, a degree in Business Development and Finance from Pepperdine University, and a degree in Public Relations from Omsk State University.
Christian Kameir
Strategic Advisor - Institutional Finance & Global Partnerships
Christian Kameir is a Founding Managing Partner of Sustany Capital, focused on sustainable infrastructure, digital finance, and institutional capital strategies. He brings over two decades of experience across corporate law, technology, and financial systems, including early leadership in the development of Europe’s internet infrastructure.
He previously served as Executive Vice President at Nikoma AG and as in-house counsel at Bertelsmann AG, and contributed to Germany’s telecommunications deregulation framework. Christian is a recognized thought leader in sustainable finance and decentralized systems, a Forbes contributor, guest lecturer at Harvard Business School, and Chair Emeritus at the Decentralized Identity Foundation.
He holds a law degree from the University of Münster with a focus on international and corporate law. His forthcoming book, Streaming Money, explores next-generation financial infrastructure and capital deployment.
Ashu Sagar
Country Director - Zambia at Sustany Global
Ashu Sagar is Country Director for Zambia, bringing over 25 years of leadership across manufacturing, industrial development, and private sector engagement in Zambia. He is a former President of the Zambia Association of Manufacturers, where he actively supported industrial policy development, trade facilitation, and sector growth,
and continues to be an influential voice in the industry.
Ashu is also Co-Founder and Chief Executive Officer of Carribea Beverages, a regional enterprise focused on building local value chains and expanding market access. He works closely with government, industry stakeholders, and international partners to advance investment, infrastructure, and sustainable economic development.
His experience in navigating regulatory environments and driving private sector-led growth strengthens project execution, stakeholder engagement, and alignment with national development priorities.
Ayo Sopitan
Strategic Advisor - Mineral Resources Strategy & Partnerships
Ayo is the Founder and CEO of Metalex Commodities Inc., a US-based carbon-neutral producer of critical metals operating in Zambia, Mauritania and Nigeria with its flagship project being a copper-cobalt mine in Northwestern Province, Zambia. Before founding Metalex, he spent 15 years in various roles in management consulting, commodity trading at EY, Accenture, OpenLink Financial amongst other firms. He is a member of the US Export-Import Bank Advisory Committee on Sub-saharan Africa, a member of the advisory board for the MIT Kuo Sharper Center for Prosperity and Entrepreneurship as well as the $1B AFA Initiative Critical Minerals Fund. He attended Bryant University, New York University and the Massachusetts Institute of Technology.
Naa Kwaley Afua Darko
Strategic Advisor – ESG Compliance, Stakeholder Engagement and Social Impact
Naa Kwaley Afua Darko is a cross-sector strategist with experience spanning international development, private equity, and global workforce systems, with a focus on structuring partnerships and scaling initiatives across emerging markets. She operates at the intersection of strategy, capital alignment, and execution, supporting building sustainable and impact-driven platforms.
She also serves as Director of Global Opportunities at The Voice of Africa Group, where she leads strategic partnerships connecting institutions, talent, and capital across education, employment, and leadership ecosystems. In this capacity, she collaborates with multilateral institutions and private sector stakeholders to align opportunities across markets and drive scalable development outcomes.
Naa also advises on large-scale initiatives focused on economic inclusion and workforce development, including programs aimed at equipping women with vocational and income-generating skills.
Naa brings a globally informed perspective, having worked across Africa, North America, Europe, and Asia, with a focus on building resilient institutions and unlocking long-term value.
Ravi Andrews
Strategic Advisor – Regional Development & Partnerships, Middle East & Asia
Ravi Andrews is a business leader with extensive experience across the Middle East, Asia, and global markets, with a track record spanning leading Fortune 500 organizations including Cargill, Robert Bosch, Tyco, Honeywell, and Airbus Defence & Space.
With over two decades of experience in management consulting, operations, and strategic transformation, he has led initiatives across diverse industries, focusing on supply chain optimization, operational efficiency, and scalable business development. Ravi specializes in translating complex strategic challenges into practical, execution-driven solutions aligned with long-term commercial outcomes.
He maintains a strong focus on sustainable infrastructure and renewable energy, supporting the development of globally relevant, investment-ready projects. He brings disciplined leadership, cross-regional insight, and strategic clarity aligned with institutional investment frameworks.
Powering Equity
Advances the implementation of gender-lens investing and inclusive development strategies, positioning Sustany as a women-led infrastructure platform aligned with institutional priorities on inclusive growth, gender equity, economic inclusion, and sustainable value creation across emerging markets.
Contributes to the development of measurable gender impact frameworks, enhancing alignment with international standards and eligibility for gender-focused financing instruments.
Institutional Depth
Through a network of senior strategic advisors, Sustany leverages deep expertise across infrastructure, finance, legal, and policy, reinforcing institutional alignment, enhancing strategic decision-making, and supporting the development of bankable projects across emerging markets.
Multinational Perspective
Through a globally diverse and inclusive team, Sustany leverages cross-border perspectives and cultural insight, enhancing its ability to operate across jurisdictions, engage local stakeholders, and deliver infrastructure projects aligned with international standards and market-specific requirements.
Precision Driven
Through a focused and expanding core team, Sustany integrates multidisciplinary expertise across development, finance, legal, and operations, strengthening execution capability, institutional alignment, and the delivery of bankable infrastructure projects across emerging markets.
Local Leadership
Through local SPV board representation, Sustany embeds in-market knowledge, leadership and regulatory expertise within each project, enabling effective government engagement, alignment with national frameworks, and reinforcing execution certainty, compliance, and long-term sustainability.
Institutional Delivery
Through Tier-1 delivery partners and service providers, Sustany leverages world-class globally recognized expertise across engineering, procurement, legal and tax advisory services, aligned with international standards reinforcing execution certainty, performance, bankability, and institutional-grade project delivery.
Powering Equity
Advances the implementation of gender-lens investing and inclusive development strategies, positioning Sustany as a women-led infrastructure platform aligned with institutional priorities on inclusive growth, gender equity, economic inclusion, and sustainable value creation across emerging markets.
Contributes to the development of measurable gender impact frameworks, enhancing alignment with international standards and eligibility for gender-focused financing instruments.
Institutional Depth
Through a network of senior strategic advisors, Sustany leverages deep expertise across infrastructure, finance, legal, and policy, reinforcing institutional alignment, enhancing strategic decision-making, and supporting the development of bankable projects across emerging markets.
Multinational Perspective
Through a globally diverse and inclusive team, Sustany leverages cross-border perspectives and cultural insight, enhancing its ability to operate across jurisdictions, engage local stakeholders, and deliver infrastructure projects aligned with international standards and market-specific requirements.
Precision Driven
Through a focused and expanding core team, Sustany integrates multidisciplinary expertise across development, finance, legal, and operations, strengthening execution capability, institutional alignment, and the delivery of bankable infrastructure projects across emerging markets.
Local Leadership
Through local SPV board representation, Sustany embeds in-market knowledge, leadership and regulatory expertise within each project, enabling effective government engagement, alignment with national frameworks, and reinforcing execution certainty, compliance, and long-term sustainability.
Institutional Delivery
Through Tier-1 delivery partners and service providers, Sustany leverages world-class globally recognized expertise across engineering, procurement, legal and tax advisory services, aligned with international standards reinforcing execution certainty, performance, bankability, and institutional-grade project delivery.
A culture grounded in discipline integrity and long-term value creation
