Sarah Beerhalter

Sarah is the head of the Nexus Component since August 2018. She has vast experience in the formulation and planning of Nexus approaches. She has worked for 10 years in the water sector in Germany and 10 years abroad implementing water, climate change and agricultural projects in Latin America and the Southern African Region (SADC) for GIZ. She has significantly contributed to the formulation of the SADC Nexus approach. Her areas of experience entail policy advice, organizational development, capacity development, knowledge management as well as project and infrastructure development, implementation  and financing. She is an environmental engineer by profession. Sarah is based in Eschborn, Germany.



Maria Ana Rodriguez

Maria Ana is in charge of the Global Nexus Secretariat. She has vast experience in the water sector, having worked for GIZ in Peru and in the Maghreb countries. Before GIZ, she worked as a consultant for several UN agencies as well as a researcher and lecturer at the Pontifical Catholic University of Peru in Lima. Her areas of expertise entail policy advice, organizational development, capacity development, private-public partnerships as well as project management. She has studied Political Science and Geography at the University of Tübingen in Germany and the University of Texas at Austin in the United States. Maria Ana is based in Eschborn, Germany.



Tina Schmiers

Tina is responsible for the Nexus Resource Platform (, a global online information hub on the topic of the Water-Energy-Food Security Nexus. She ensures its operation, maintenance and development. Her main responsibilities include Nexus networking activities, build up cooperation with other Nexus-related programmes and create contributions for the platform. She further supports the Global Nexus Secretariat. Tina completed her Master’s Degree in Sustainable Development at Uppsala University in Sweden and holds her Bachelor Degree in Water Resources Management. Tina is based in Bonn, Germany. 



Luca Ferrini

Luca is the Regional Coordinator for the Nexus Dialogue in the Niger River Basin in West Africa. He is in charge of advising the Niger river Basin Authority, including its nine Member States, on mainstreaming the Nexus approach in regional resource planning and investment efforts. In his previous assignment, Luca worked for a European multi-donor programme on Energy Access in Africa, advising the European Commission in Brussels. Before that, he led research projects on multidimensional poverty in rural communities in South-Western Uganda, where he is still involved in the running of local community development projects. Luca’s interests lie in poverty eradication, the combination of socio-economic development and environmental sustainability, and effective altruism. He holds an MSc in Comparative Social Policy from the University of Oxford, UK



Dr Nisreen Lahham

Dr. Nisreen Lahham is the Regional Coordinator for the Nexus Dialogue in the MENA region. She was previously the Executive Manager of the Centre for Futures Studies and a technical expert at the Information and Decision Support Centre, the think tank of the Egyptian Cabinet. Nisreen received her PhD from the Faculty of Engineering at Ain Shams University in Cairo. Her interests include environmental planning, food security, water security, and green communities. Nisreen is based in Cairo, Egypt. 



Antonio Levy Berstein

Antonio is the Regional Coordinator for the Nexus Dialogue in Latin America and the Caribbean (LAC). Antonio has over twenty years of experience in international cooperation, especially in the fields of renewable energy and climate change mitigation as well as project finance, management, evaluations and finance. He holds a Master´s Degree in Business Adminisatration (MBA) from the University of Chile and Tulane University. Antonio is native bilingual English and Spanish and is based in Santiago, Chile.