The Team

Our Team

Anne-Laure Le Cozler

Marketing, Communications and Impact management

Anne-Laure has international communication and digital strategy experience both in consulting firms and NGO’s across Europe and Asia. She has particular expertise in leading international projects in CRM, data mining, and user experience. She is now focusing on market analysis and impact measurement and management to support SMEs in understanding the need to collect appropriate data to facilitate their decision-making process and unlock impact investment opportunities. Anne-Laure loves exploring the world and has been living in Asia for 5 years. She likes climbing and practicing yoga.

Chanvibol Meng

Technical Services Manager

Chanvibol is a technical expert with more than 10 years of experience in sustainable development projects in Asia, particularly renewable energy and water supply. He provides technical support to Nexus’ carbon development projects, clean energy financing facilities, and other energy and water supply related projects. Chanvibol holds a Master of Engineering in sustainable energy from Australia’s RMIT University and a Master of Engineering in eco-environmental civil engineering from Japan’s Ritsumeikan University. Chanvibol likes singing and playing Badminton.

Clarisse Kehler Siebert

Executive Director

Clarisse, an international environmental lawyer, brings to Nexus a wealth of knowledge and an array of experiences in climate change and sustainable development research and policy. Before joining Nexus, Clarisse worked at the Stockholm Environment Institute, where she managed a research portfolio within the Climate, Energy and Society research group and also served as Unit Head of this group for three years. As a lawyer, Clarisse also worked at one of Canada’s leading law firms assisting provincial governments in the early days of implementing a carbon tax and regional trading scheme, and with client companies in the scoping and design phase for Clean Development Mechanism projects under the Kyoto Protocol.

Ha Hoang Thanh

Technical Manager

Ha Hoang is an international professional with 10 years of experience in managing technical services for carbon projects, working closely together with government and partners. He oversees all technical work undertaken by the technical team and is responsible for quality control. He manages the technical services for carbon projects throughout the complete carbon project cycle. Ha holds two bachelor degrees in Electrical Engineering and International Economics. Ha likes exploring nature with his son and is always up for new challenges from writing songs to running marathons.

Justin Bergendahl

Head of Renewables and Climate Asset Management

Justin currently focuses the majority of his time on the Pioneer Facility team after working for over two years with Nexus on our carbon finance functions. Justin has experience working for the past seven years for carbon market platforms, the United Nations Sustainable Energy Division, and the International Centre for Trade and Sustainable Development on carbon emission and energy programs. Justin holds a master’s degree in Energy and Earth Resources from the University of Texas and a certificate from Duke University on Global Policy (Environment, Energy, and Economics). Justin is an insatiable learner, from photography to coding, he is very inspired. 

Miguel Proença

Head of Investments

Miguel has over 14 years of experience in the structuring and setting-up of financing structures, having worked most of this time in Project and Leveraged Finance transactions. Infrastructures and renewable energies have been his areas of expertise, but what drives him is the feeling that he is contributing in any way to improve people’s lives, and that is why he has joined Nexus for Development as Head of Investments. He holds a degree in Economics and a Masters in Modern History. There’s no morning for him before an expresso and no day goes by without a good laugh moment!

Pierre-Louis Vie

Investment Analyst

Pierre-Louis has more than 2 years of experience in Impact Investing in Cambodia, Vietnam and Myanmar. He has worked in an early-stage Impact Fund where he built expertise in analyzing and supporting start-ups in their fundraising and business development. He is specialized in Smart Agriculture, Energy Access and WASH and holds a Finance Master’s degree from Kedge Business School in France.
Pierre-Louis loves listening and making music, playing tennis and taking care of his urban farming project in Phnom Penh.

Pol Raguénès

Business Development Lead - Europe

Pol is an expert on VER Carbon Credit sales with more than 10 years of experience. He represented the commercial interests of more than 30 energy & water projects in the world (Latin America, South-East Asia). He concluded multi-million VER sales agreements for these projects. Pol joined Nexus to continue his work towards helping project developers achieve their financing objectives, in particular through the Voluntary Carbon Market. He holds a master degree in International Affairs with specialization in Energy. Pol is a pianist and a nature aficionado.

Seng Channeang

Finance and Administration Officer

Channeang supports the finance and administration activities at Nexus and coordinates with suppliers and vendors. She has a great experience in working as accountant and chief accountant both in private sector and with NGOs. She holds a degree in accounting. Channeang likes knitting and spending time with her family.

Suy Choup

Finance and Administration Manager

Suy is a technical expert with more than ten years of experience in finance and administration management, particularly grant and budget management. He also provides technical support to facilitate the transactional and operational functions. Suy holds a Master of Development Management for sustainable development from Philippine’s ASDECS University. Suy loves sport, particularly football and cycling.

Sreychantheary Khut

Finance and Administration Manager

Theary is responsible for the financial management of Nexus suite of services, financial planning, monitoring, and reporting.
She also ensures Nexus compliance with relevant local regulations, internal policies, and donors and investors’ requirements. She holds a Master’s degree in Finance and Banking. Theary likes cycling and playing badminton.

Our Board

Ben Jeffreys

Member Representative Director

Ben is the CEO of ATEC Biodigesters International, a social enterprise start-up that produces, sells and distributes household biogas systems in Cambodia. Each system produces gas for cooking as well as organic fertilizer that is estimated to save an average rural household $260 per year. Ben has more than 10 years of experience managing teams in the social enterprise, international development, and corporate sectors. His previous roles include National Development Manager at The School for Social Entrepreneurs, Product Development Manager at Oxfam Australia, and Regional Sales Executive at Westfield Ltd.

Jeffrey Lamb

Board Chair

Jeffrey is an international executive with over 15 years of experience operating at the intersection of business and government in the pursuit of business, economic and social growth. Jeffrey currently serves as an Advisor with UNDP’s Climate Change team, an Oversight Committee Member of the “Investing in Infrastructure” program in Cambodia of the Australian government, a Fellow with the Center for Asia Leadership, and as an Advisor to a select group of technology companies. Jeffrey holds an MPA from the Harvard Kennedy School of Government, as well as an MA in International Management and a BA in Government from the University of Texas at Dallas.

Jochen Nimtschek

External Director

Company working on technical payments and financial services (retail banking, P&C and life insurance, wealth management) with a focus in Europe, Australia, and Southeast Asia. In addition to his last leadership role, Jochen has three years of pre-sales experience with a payment technology start-up in Europe and the US. Jochen’s functional expertise is in customer strategy, marketing, experience design, customer loyalty as well as segmentation, distribution channels, sales force effectiveness. Jochen is passionate about training and talent development and brings to the board extensive knowledge having led large-scale programs across diverse organizations and driving change.

Libby Wallace

External Director

After 30 years working in human resources and community development for the state government of South Australia, Libby lived in Cambodia for four years where she worked in human resources and organizational development. At the beginning of 2018, Libby took up a role as HR Manager with a social enterprise focusing on providing access to clean water to the people of Uganda. Libby has extensive experience in organizational development and human resource management, and she enjoys exploring how an organization’s culture and structure contributes or hinders the accomplishment of its goals. Libby’s recent work has focused on organizational strengthening including the redesign of the Board of Management for the Cambodian Physical Therapy Association as well as the development of their private clinic.

Martin Hiller

External Director

Martin Hiller is Founding Partner and Director at Millwater Partners, a consultancy company focused on putting the Sustainable Development Goals at the heart of organisational and corporate strategy. He has over 30 years of experience working on sustainability issues, climate change, and clean energy, in policy, investment, and campaigns. Before setting up Millwater Partners, Martin led and re-built REEEP, an international non-profit working on clean energy in low- and middle-income countries. Prior, Martin had a distinguished career with the World Wildlife Fund (WWF) where he led campaigns in WWF’s global climate and energy program culminating in the WWF campaign for COP15 in Copenhagen, which mobilized 6.5 million sign-ups, the highest number of any NGO.

Maya Stewart

External Director

Maya Khonje-Stewart represents Hestian on the Nexus board. With a passion for environmental preservation, Maya is a renewable energy advocate with more than 10 years of professional experience in the private and NGO sectors. Maya has used her skills in business development, sales, and logistics, project management, budgeting, and negotiation to promote fuel-efficient technologies. Her successes include the development of innovative marketing strategies for improved cookstoves and solar products in Malawi. Maya is actively involved with the development of the new Malawi Energy Strategy, which has evolved to meet the energy needs of the local population through biomass technology. Maya also sits on several boards for other environmental INGO’s including local micro-finance institutions and the Rotary Club of Lilongwe.

Rachel Pringle

External Director

Rachel is the former CEO of Hydrologic Social Enterprise. Rachel worked previously with International Development Enterprises (IDE), where she advanced the organization’s micro-finance initiatives and managed the launch of iDE’s in-house credit unit and carbon finance. Rachel’s career achievements include technical consultancies with reputable financial and engineering institutions in the UK and South Africa, where she provided expert advice on a diverse range of projects.

Thomas Blackburn


Thomas is an experienced sustainability and carbon professional currently working as Business Manager at EcoAct. With over 6 years of experience in Southeast Asia developing funds for low-carbon projects, he has a strong grasp of value-chain opportunities and results-based solutions.

Yakub Hossain

External Director

Dr. Yakub Hossain is a development expert in Improved Cookstove (ICS) research, development, testing, dissemination, promotion and marketing globally. With more than 30 years of experience in rural and urban contexts, Dr. Yakub is well respected for his extensive experience in WASH and the environment. As Deputy Executive Director at the Village Education Resource Center (VERC), Dr. Yakub is responsible for the program management, implementation, monitoring and evaluation in rural and urban areas.