Reuben is an economist and climate finance expert specializing in climate risk, sustainable finance, and international economics. He is the Founder and Director of Climate Shapers Africa Limited, a specialist consulting firm focused on climate and nature finance and executive trainings. 

Prior to founding Climate Shapers Africa, he worked with the United Nations, Credit Suisse, and McKinsey. He has advised and consulted for a wide range of banks, DFIs, NGOs, governments, and central banks, including the IFC/World Bank, European Investment Bank (EIB), European Bank for Reconstruction and Development (EBRD), Rockefeller Philanthropy Advisors, and WWF. 

Reuben is a recognized expert on climate finance and the greening of financial systems. He served as a Senior Climate Risk Expert on the Central Bank of Kenya technical assistance programme that developed the Kenya Green Finance Taxonomy. He has delivered technical assistance and capacity-building programmes across multiple countries, training more than 1,500 senior executives and policymakers, including central bankers from 20 countries. 

His work has been featured in leading platforms including the Centre for Economic Policy Research (CEPR), World Economic Forum, Project Syndicate, and Green Central Banking. He has received several international awards, including the St. Gallen Wings of Excellence Award and the Rudi Dornbusch Prize in International Economics, and has authored numerous published articles, commissioned reports, and book chapters. 

He holds a Master’s degree in International Economics from the Geneva Graduate Institute (Switzerland) and a Bachelor’s degree in Financial Economics from Strathmore University (Kenya). He is currently pursuing a PhD in Economics at the Geneva Graduate Institute. He is adjunct faculty at the University of Cape Town (South Africa) and Strathmore Business School (Kenya), and a frequent speaker and moderator at industry forums on sustainability and green finance.

He is the Founder of the Kenya Climate and Nature Directory – Kenya’s largest repository of climate and nature knowledge resources. He is an Agenda Contributor to the World Economic Forum (WEF) and serves on the Climate Finance Working Group (CFWG) at the Smith School, University of Oxford. Since 2024, he has also served on the Steering Committee of the United Nations Environment Programme (UNEP) AgriFood Project in Kenya. 

An avid traveler, he has worked/traveled in 24 countries.