Xavier is a sociologist and socio-economist specialised on energy and environmental issues. His main research interests are on: clean energy policies, energy access in developing countries, the decision-making on large infrastructure and conservation projects.
Currently he is the Principal Investigator of a British Academy funded research on "Large Water Projects and Conflicted Territorial Identities in sub-Saharan Africa: The Case of the Development of the Senegal River".
Previously, he was responsible of two DfiD-EPSRC funded international research projects on supporting African municipalities with sustainable energy transitions and on developing a pro-poor public private partnership model for delivering clean thermal energy services in developing countries.
From 2005 to 2011, he was research fellow at the Centre for Management under Regulation - Warwick Business School, where he coordinated a network of energy regulators in the Global South promoting energy access through clean energy.