Haroldo Gambini Santos is a Senior Applied Scientist at Amazon.com. For 10+ years he was a Professor at the Computer Science department of Universidade Federal de Ouro Preto. In 2018-2019 he was a Senior Researcher at the CS department of KU Leuven, Belgium. His research focuses on algorithms and models for combinatorial optimization problems. In 2019 he won the COIN-OR Cup award for his contributions to the CBC mixed-integer linear optimization software. In 2012 his team won the Second International Timetabling Competition. From 2012 to 2020, he was a member of the COIN-OR Foundation Technical Leadership Council. He authored several papers on prestigious operations research journals such as Computers & Operations Research, European Journal of Operational Research, Annals of Operations Research, Journal of Scheduling among others. Haroldo is the co-creator of Python-MIP.