Sylvain Chevallier is a professor at the Université Paris-Saclay and works in the Laboratoire Interdisciplinaire des Sciences du Numériques (LISN) on geometric methods for multivariate time series analysis and prediction, as well as anomaly detection. He worked for 10 years at the Versailles Systems Engineering Laboratory on assisting people with disabilities, integrating brain interfaces into experimental and collaborative art-science applications. He is vice-president of the CORTICO learned society for the promotion of brain interfaces. He leads several open and citizen science projects to improve scientific reproducibility and facilitate the appropriation of brain-computer interfaces.