This talk will cover Lionel Coussein’s role in Energy & Climate Scenarios, followed by an illustration of the usefulness and relevance of studying these scenarios for evaluating decarbonization options in aviation. As a TSE alumnus, he will also showcase the diversity of roles and activities available to TSE graduates. Drawing on nearly 30 years of professional experience, from biostatistician to Head of Business Intelligence, he will provide concrete examples of day-to-day tasks and responsibilities across these varied positions.