He is a Machine Learning researcher with an emphasis on Reinforcement Learning and Multiagent Learning. He holds M.Sc. and Ph.D. degrees from the University of São Paulo (USP). Between 2018-2019 he was a member of the Learning Agents Research Group (LARG) at the University of Texas at Austin, USA, with Prof. Peter Stone. Leno has also been a machine learning research intern at Borealis AI in Edmonton, Canada. He has served as a Program Committee member for several conferences, including IJCAI, AAMAS, and ICML, and as an organizer for several workshop series, including the Adaptive Learning Agents (ALA), the Latinx in AI (LXAI), and Scaling-up Reinforcement Learning (SURL) workshops.