Olivier Cappé specializes in various aspects of machine learning, statistics and signal processing. In the distant past (1990s), he started out in the field of speech and sound processing. More recently (2000s), he has contributed to Bayesian methods, Markov chain Monte Carlo and some natural language processing applications. Most of his recent work (2010s) is linked to e-learning and multi-armed bandit models. Since September 2021, Olivier Cappé has been affiliated with the newly-created Centre Sciences des Données (CSD) at ENS. He is also Deputy Scientific Director of the Information Sciences and Technologies Division (INS2I) at CNRS, where he is in charge of actions in the field of information sciences in the broadest sense (on topics such as artificial intelligence, cybersecurity and quantum computing).