I am Fabien Pesquerel, a Machine Learning PhD student in SCOOL team (previously SequeL) at INRIA and a teacher assistant of Reinforcement Learning master courses at Polytechnique, Lille University and Centrale Supélec. I am interested in designing sequential learning algorithms and I attach great importance to the theoretical guarantees. Specifically, I am interested in designing algorithms that can adapt to changing environments, interact with their environment, learn what to learn and learn what to do in order to achieve specific goals. My PhD thesis is about structures in reinforcement learning and focuses on the what to learn and the what to do parts. I am doing my PhD thesis with Odalric-Ambrym Maillard thanks to a grant from École Normale Supérieure de Paris.